From what I can tell, D.Jack & J.Jack share snaps at that position.
We're definitely gonna miss D.Jack's Senior leadership on the D-Line -and D overall-, but there shouldn't much of a dropoff with J.Jack & Garvin sharing snaps.
But I do agree with the OP though, we're wasting Patchan's time at TE, I think He can make an impact on the D-Line.