I think the first one is selfish. Using your pokemon as stepping stones to get your ultimate objective with nothing in it for them at the end. Where are they going to go after you leave? Especially since they've developed a bond with you. [ Okay, now she's blasting into mind fuckery, sorry, Flora ): ]

Yes. The old tale that defeating all gym leaders gets you the ability to leave is still surprisingly prevalent in suggestions on how to return.