I am a big supporter of platoons, in the right situation. There are both PLUSes and MINUSes to a platoon (5-in & 5-out).
1- that your "2nd 5" are all pretty good, not much worse than the 1st 5
2- that you have all the positions filled, with guys in well-defined roles
In 2015, until the Poythress injury, that was nearly the perfect situation for a platoon, and as a result they were playing Historically GREAT Defense!!! We were 1 quality player short (Lee was a weak link). But when Poy went down, that put us 2 short, so Cal left the platoon for a more traditional 8-man rotation, but often substituting 3 in together at a time.
Platoons do NOT have to be an equal 20/20 split in minutes. They could be 20/20, 22/18, 24/16, 26/14, 28/12.
I do NOT think we will reduce down to 8 guys. Pope has a history of playing a lot of guys (like the RP teams he played on did), I think he only reduced down this past year due to injuries, and this is why he is building us even deeper for next year.
But next year may be difficult to do a platoon, because multiple guys may play at multiple positions (so not well-defined roles). I think we will have 10 guys playing 10+ mpg.