Sigh. I'll try again, since you've missed my point.
The Core 5 are developing because RJ and MW are facilitating them by playing their complementary roles - provide spacing with their outside game, running the offence, being the last option. Take out RJ and MW and we're back to where we were when JLIII was running the show - no spacing, no offence, no more development of the Core 5. Winning is just a side-effect from their development. After waiting years for them to be given this opportunity, do we really want to handicap the Core 5 now?
Also: who says MW isn't going to be back next year? RJ has said he's not coming back, but I haven't seen any indication from either side that MW isn't coming back.