Leitch-Smith then calmed any nerves around Gresty Road with a cool finish after 69 minutes after MK Dons missed a penalty.
Davis said: "I was surprised Chuks took the ball for the free-kick as he only practices them a little bit.
"But he's very confident and that's what he can do. It got a little deflection off the top of the wall but I don't care.
"I was going to take Ajay off at half-time but I said to him, 'Get yourself going second half,' which he did and he didn't show a lack of confidence with his finish.
"I congratulated Ben on the penalty save and we have a check of where takers have gone over a time, so we had an idea and Ben went a bit earlier and was able to cover the post.
"They started brighter than we did but we knew if we could keep them out of the first half hour, we'd come through the game okay.
"If we keep playing that way, we'll be fine."