CD..? [Answered]

You are totally correct a physical disk is required to be in the disk drive to enable the owned game to be played. The only way to own it digitally is to pirchase it digitally. The only real downside to digital games is you cant currently lend or sell
them.

All games have to be installed on the Xbox One whether they are disc or digital. It's due to the technology. The 360 did not require games to be installed which is why a 360 game may show differently, but will still install the game on the One.

Thing is the only game that is installing is Skylanders while the other which is the 360 game is DOWNLOADING not installing so how come is one installing (also updating) and the other is just downloading and not even installing a single GB.

You'll have to have the disc when you want to play. It does not equate to a digital copy of the game, so if you want to install and play it, you'll need to have the game disc in the drive. I have switched to digitally owning games since they offered
that on the 360, and has proven very good, even more so when they introduced backwards compatible titles, where they now just appear magically on my Xbox One for install and play. The downside to not owning a disc can be you don't have access to offline games
if it's not installed and you don't have an internet connection, but that hasn't been an issue for me, but just note there are SOME downsides to digitally owning it.

Got another question if I may,from what I understood once you insert a CD you are supposed to be able to play right away right?

Like that is the whole point of a CD which is as you said. Saves internet and data for those who either lack internet or want to play something quick and don't have fast enough internet to wait for the game to download.

So why in my case I have 2 different CDs 1 is Xbox One S (Game's Skylanders Trap Team) which has 16 GBs of the game on the disc but still needs to update about 3 GBs. And another CD which is Xbox 360 (Game's Assassin's Creed IV Black Flag) which has no GB on
the CD AT ALL so instead of showing "Disc 11.13 GB of 16.20 GB (which is Skylanders' installation process from CD to Xbox) it shows Network: 11 MB of 11.35 GB so basically the whole game needs to DOWNLOAD and not INSTALL. Got explanation for that please?

You'll have to have the disc when you want to play. It does not equate to a digital copy of the game, so if you want to install and play it, you'll need to have the game disc in the drive. I have switched to digitally owning games since they offered
that on the 360, and has proven very good, even more so when they introduced backwards compatible titles, where they now just appear magically on my Xbox One for install and play. The downside to not owning a disc can be you don't have access to offline games
if it's not installed and you don't have an internet connection, but that hasn't been an issue for me, but just note there are SOME downsides to digitally owning it.

Got another question if I may,from what I understood once you insert a CD you are supposed to be able to play right away right?

Like that is the whole point of a CD which is as you said. Saves internet and data for those who either lack internet or want to play something quick and don't have fast enough internet to wait for the game to download.

So why in my case I have 2 different CDs 1 is Xbox One S (Game's Skylanders Trap Team) which has 16 GBs of the game on the disc but still needs to update about 3 GBs. And another CD which is Xbox 360 (Game's Assassin's Creed IV Black Flag) which has no GB on
the CD AT ALL so instead of showing "Disc 11.13 GB of 16.20 GB (which is Skylanders' installation process from CD to Xbox) it shows Network: 11 MB of 11.35 GB so basically the whole game needs to DOWNLOAD and not INSTALL. Got explanation for that please?

Yes, technically the game files may be on the Disc and install to your Xbox hard drive from there, however in practice as soon as you insert the disc it will check on the internet for updates to the game, to make the game better and fix issues, and it will
99% of the time have to download the whole game over the internet anyway, so in reality, the Game Disc is just to authorise you to play the game.

Games installed from the disc require the disc to be in the console to play the game. You have to bring the disc with you if you wan tot play that game on another console.

I now purchase everything digitally.