Wow! And I get accused of skewing statistics...
You can't make sensible comparisons between the 3 sides over the last 6 games because in each case it's 6 completely different games in different circumstances. City had no really difficult games in their last 6 - Spurs away was probably the hardest, on paper, but Spurs long since had the flip-flops on by then.
Arsenal had 2 difficult games and they got decent results in both. Chelsea came and parked the bus, something they're experts at, and that was the only points we dropped in a 10 game run before the Swansea game. A draw away at Utd is never a bad result, they only lost 3 home games all season and they were all silly ones. Chelsea drew there, City lost.
If we did 'collapse' then it was only after the title had gone. When we played Swansea we couldn't be champions any more. Even then we only 'collapsed' from 2nd to 3rd, we did enough at Old Trafford to assure automatic CL qualification. There was some concern about momentum going into the Cup Final but we got a good result on the last day and stormed the Cup Final.