Jesse has played less than 12 minutes in six games this season but just two of them have been in February or March. I wouldn't worry about some occasional games like that, if a player doesn't get much PP (or PK) time some games tend to be like that.
Even with the tough (for the whole team) three Toronto games he has scored 7 goals in the last 14 games. Edmonton Journal wrote about him today:
Spent almost equal time on lines with McDavid and Nugent-Hopkins, and enjoyed outstanding possession numbers with both. Oilers had a 76% share (19 for, 6 against) of shot attempts during his 13 minutes at evens. Had 2 great chances of his own from close range, a deflection from the low slot and the rebound from a point shot, cashing the second of those for the all-important 1-1 tally late in the second period. Credited with 3 shots and 4 hits in an impressive all-round performance.
I still believe he keeps developing and can bring more especially with more and more PP chances, but right now the main thing is he's worth a top6 place. Occasional quieter games happen to everyone but the bigger picture has looked positive for quite a while now. As it does to the whole team IMO despite the nasty losses to Toronto. The bigger trend is positive.