That's not how that scene went about at all. The choice and order came from above their pay-grade. In fact, it was specifically mentioned that the choice had to come from within the team. They then defaulted into Ichigo who was who offered her services. In fact, Zero Two took herself from the running as it was, and in fact later told Ichigo to go for it herself.
And he should have a problem pairing up with Ichigo why? She's the team leader, and from all we have seen, they've had a good relationship.He's a dude who was already resigning earlier with the intention of returning to whatever godforsaken place it was where he was brought up, because he had realised he's a total failure and there's no hope for him. Yet now he was suddenly okay with pairing with Ichigo.
From what I gathered from that scene, compatibility aside, it seemed like he should've been able to pilot with just about anyone qualified if he was a legit pilot. He seems to be an exception to the rule. It was specifically stated that they were testing specifically for Hiro's aptitude, and it seemed in that context the partner was irrelevant. Heck, when the test began, it seemed like Hiro and Ichigo were well in-sync. Then whatever happened, happened.Zero Two is extraordinary. Ichigo is ordinary. That should have made the dude put 2 and 2 together, but instead he thought that when he managed to pilot with 02 (even though it was abnormal leaving him no memories of it) then surely he can pilot with everyone. Even though he was already resigning himself earlier because that's not the case.
In this context, man I feel terrible for Naomi... chances are that she would've been fine if she had taken the previous test with anyone but Hiro.
Yet in the Papa Group there were people objecting to having their precious Zero Two pairing with 016 because he would contaminate her.In fact the staff should be able to connect the dots even if the dude himself hasn't got the brains for it. Which is why I said they should just use him even if it costs him his life.
Just the same, as mentioned above, in that specific scene it seems that being able to test for Hiro's aptitude who he partners with should be irrelevant, but this is a unique case it seems.In the first place we know the two pilots need to have a high degree of compatibility to be able to operate the vehicle. If that compatibility drops for whatever reason, it's game over. This means, I reckon, that you can't just be paired with anyone randomly. I just hope Ichigo's feelings for the MC won't affect her cooperation with her existing pair, Gorou.
All this to say, I have no real issues with you having problems with this MC and your characterization of him, but you're also attributing a lot of his flaws to things he had no control over and actually immaterial all told.