In that case where do you get the greatest return on your investment in terms of training? Where can the greatest marginal gains be made with the least effort?
I suspect that the HIM will decide it. You gave up c.30minutes over an IM distance swim which suggests that Jon is going to come out of the water c.15minutes ahead of you on the HIM. IIRC you'll be similar on the bike and you can claw back 15minutes on the run... possibly. That leaves you equal as things stand, and thus still behind in the GC. I'd wager that your best bet at clawing back those 13minutes and 18seconds is to get back in the wetsuit and try to minimise your losses there. Meanwhile Jon will be working on his run in the hope of holding you off as long as possible.
I suspect that for both of you your bike legs are sufficiently developed that it will be disproportionately difficult to win back additional seconds there.
Intriguing viewing... good luck both!