What I want to see out of Jenkins is consistency, if he can't be consistent in AAA, we shouldn't expect him to be so in MLB. His last 5 weeks of production look like this (from recent to oldest. Numbers courtesy of TD MiLB weekly reports).
.368/.478/.474 (.952 OPS)
.190/.227/.238 (.465 OPS)
.286/.412/.643 (1.055 OPS)
.313/.389/.438 (.826 OPS)
.350/.381/.650 (1.031 OPS)
I don't know what those slash lines combine for over the last 5 weeks, but there is (1) terrible week, (1) slightly above average week, and (3) elite weeks. If he would have put those elite weeks back-to-back-to-back I would be all for promoting him, but he fell off after each elite week, one very much dramatically so.
Lombardi and Clark were promoted because they strung 3 or 4 elite weeks in a row, with no drastic production drop-off mixed in.