While Jennings was at his best when he was playing in the hole in a 352 in December, I still think he has done a good job on the left hand side in the last few weeks. He was good against Woking and Maidenhead, and I think playing against his former club affected him yesterday as much as anything.
We don't really have the players this season to play 352. We used that system for a few games before Christmas, but that was with DMH at right wing back, which is not even his best position. There is no way Ginnelly or Buxton can play that role, so 442 is the most suitable system at the moment. Ideally we would play every player in their best position, but that is not realistic, certainly not with a relatively large squad like we have.
Given that Ginnelly is expecting to play regularly, it is likely we will play 442 with Josh and Tollitt as wingers once Ben is fully fit. Last season Mellon preferred Tollitt to Jennings when there was a straight choice between the two.
Regarding Wallace, as has been commented above, I think it is important that we only use him if it benefits the team as a whole. I don't think he could cope in a two-man midfield with Norburn for example.