I think the way McInnes utilises a team doesn't lend itself to having a big squad. He has always over reliant on certain players that the rest are ever rarely tried and tested. The last week is a complete rarity and I agree we shouldn't build with this in mind, however, what it also shows is that the wider signing policy if fucking dog shit. That stops with him. And I mean, those outside his normal chosen team. The first XI is strong, no doubts about that, but you have to question why some of the others were signed if that's the level of their output (not that we didn't know that already). Maybe he's tried to have a bigger squad this season and change this but they're clearly not up to the job. They were probably concealed by the rest of the team doing their job.
Given Jan is never a time to be able to make proper change, a big summer coming up.