"I know a guy" who did the HIMS route at SWA pre-covid. He was back on the job re-doing initial after almost exactly one year. Different circumstances I know and it may not be applicable, just pointing out that SWA has a history of facilitating that particular route if you say the right words and fill the right squares.

Bailing out and coming back without a documented reason... That could easily raise red flags with HR no different than a big gap in flying or a period where no recurring checkrides were recorded. It just begs the question and they'll be obligated to find out what happened, regardless of what was officially disclosed by the applicant.

An off the record talk with a SWAPA HIMS expert might provide some clarity, dunno if they're allowed to spend the time with someone who left and is looking to come back though.