Yeah, I think Tottenham have to be favourites to secure fourth place at the moment, 2 points behind with 2 games in hand, it seems certain they will overhaul United. And yes, United have much bigger internal problems than Spurs do. I don't think Man U will get a Champions League place this season. Ronaldo is getting a bit twitchy as well, they could quite easily implode.
Totenham have two fewer games than Man United. They will play Southampton, Wolves and on February 20 they will against Man City. The two early opponents they might be able to beat, because their level was below Totenham's. But for Man city it might be difficult. So the chances of knocking Man United out of number four are quite large. They will play two matches at home. At least that's the first advantage that must be utilized to get 6 points. Actually there are still many chances that may occur there are still about 15 matches again until the completion of the end EPL, he who consistently will win in position 4 or more.