I think a lot of things went on against Leicester that were obvious but we were unable to resolve all of them in previous matches (except At the end of the Unsworth reign/start of Allardyce).
As @Bigjmill mentioned about Coleman being back allowing Keane to play his own game and let Jags help out Martina without being left open.
Gana being fit again and transfer talk around Schneiderlin allowing Davies to start.
Coleman being back also gave us a creative outlet for an entire game (not just when 1 person randomly tried something good).
A guy up front that was capable of running on more mature legs for a full game.
Sigurdsson being allowed the time & finally getting up to speed with his teammates to look worthy of the price tag (in todays market).
It all just clicked to make us a decent team again. Now, the run of form recently has destroyed our confidence and it wouldn't be Everton if we won a game easily. So we still lost our shit from the penalty onwards.
Haha you went into more detail, just slightly and your more right than i am pal, Coleman if he stays fit can be the catalyst for a much better end to the season, than how it started..... Now for the left hand side.