Doesn’t MPC have that note-off bug when sequenced externally? I think that would matter a little bit.
If you’re only syncing them then it’s just dealing with the elektron pattern change behavior, and I suspect that’s what the OP is referring to in saying they read elektron gear doesn’t like to be slaved.
It’s less that it doesn’t like to be slaved and more that it behaves in the way that elektron designed it to work, which may not be the same as how other gear stages PC.
But there’s a whole long topic about that, so I digress.