Portable Ops is canon in the MGS Database as a part of the main story arc, even if it is a minor one.
Peace Walker is essentially the direct sequel to MGS3/prequel to MG in telling the series of events leading up to the creation of Outer Heaven. From an overall story arc perspective, it's a significant part.
Presumably, there will some day be a game titled MGS5, although with the story of Solid Snake finished, it would have to move in a different direction. The main conflict and story arc was closed and there really isn't any motivation for another mission unless they want to make MGS 5: Retirement Ops.
Rising sounds like it may be another story gap filler in explaining the events alluded to in MGS4, directly following MGS2, rather than another story that happens after MGS4.
Not much point in quibbling over which game deserves or should have had a number in its title.
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