If he knows his intentions right now, the ethical thing to do would be resign as Delta MEC Chairman. Or at the very least - recuse himself from any decisions having to do with domestic scope.
ALPA is different than in the past. The RJ airlines have a far different agenda than the mainline.

I think his decision last year to settle the scope grievance and allow the extra 76 seaters is a classic example of something he should not have done if he knew he was going to run for ALPA President.

Same goes for allowing Republic to continue their Delta codeshare and not file a grievance.