Board Thread:Questions and Answers/@comment-212.35.14.225-20150704132426/@comment-193.60.218.253-20150918080714

Wheather Metal Gear Solid Portable Ops and Metal Gear Rising Revengeance are canon or not I dont know I cant answer that but there is no doubt that they are not part of the main series due to the fact that in MGSV Ground Zeroes Deja Vu and Jamais Vu missions dont have the title acknowledged or the light able to remove it.

MG, MG2, MGS, MGS2, MGS3, MGS4, MGSPW, MGSVGZ all have their titles acknowledged by Kaz and he gives information on them and the light is able to remove them.

While it doesnt answer if MPO and MGRR are canon they pretty much tell us that they are not part of the main series.

And Im not being funny but the Digital Graphic Novels on the Legacy Collection anyway are not games they are movies that show alternatives to the stories.