Rare Jewel
Patience
but JVR's exit stats are 2nd best on the team and very close to PK's so according to Menzinger PPP's stats our top line should never be trapped in our end
That's one way to look at it and it has some value. Interestingly, He's been well over 50%(52.1, 56.9, 53.8) in defensive zone starts the last 3 years, So he needs to be proficient in exiting the Dzone. But, I'm speaking more to the "Kessel is a bad possession player" in general issue.
Boston - 07/08 - GP 82 - 53.6%cf(F%52.4) - 3.3rel(53.4 Dzone starts)
Boston - 08/09 - GP 70 - 53%cf(F%51) - 2.9rel
Toronto - 09/10 - GP 70 - 53.9%cf(F%54.2) - 1.8rel
Then it falls below 50% over the next few season; And the most obvious reason is being paired with Bozak and also JVR/Lupul cause when he was perceived to be worse player like Stajan, Ponikarovsky and Kulemin these numbers were much better, But the chemistry much better overall for the line he was on.
Coaching is another factor as well of course.