The Gunners loanee is in splendid form at Upton Park - his move away from the Emirates now makes no sense at all.
Arsenal's defending right now is something supporters simply won't wish to discuss.
The north London side were 3-0 down to Stoke City on Saturday before they could even comprehend getting back into the game. That they reduced the deficit to one by full-time only highlights the stark contrast between their quality in defence and attack.
How bad does the decision to loan him out to West Ham look now?
Granted, hindsight is a wonderful thing, as Mathieu Debuchy and Calum Chambers' signings seemed to render Jenkinson's position in the Arsenal team futile. But look at the facts now: due to injuries, Arsene Wenger has been forced to play a 19-year-old at right-back in Hector Bellerin.
Chambers has looked much better at centre-back this season and Debuchy has not yet returned from a lengthy injury.
Wenger wasn't to know all this at the time - but should he have kept Jenkinson on board considering how threadbare he was at centre-back?
As things stand, it is looking like his worst transfer decision of the summer - and West Ham are reaping the rewards.