It seemed like Maatsen got quite exposed a couple of times after he came on
Yep, I noticed that too. Not a criticism of his effort though, more that he was just a bit more advanced on that side - which might have been to instruction, given we were chasing a win.
I'm not sure I agree with those calling for him to start, but I am more than happy to see a few more length cameos to see what he can do. He looks to have the necessary attributes physically, so let's see him go at a couple of players 1v1, and be subject to a few tackles before we decide if he's ready for the starting eleven.