I'm going to go in order seems those are basically all the arguments that people going for the Glooms have used:
As for the Glooms and Mal...actually, do we even have an idea of what Mal's stats are like?
It's speculated that in the 40 that is the bare minimum that would let us try the Coven (albeit with 60% chances of failing).
There's also the possibility that he has traits similar to Temujin's unfamiliarity with modern life, due to.being stuck in his own castle.
Yes, he probably will have a trait like that that prevents him from going to Quests or do learning things.
But anyway...even if Mal is better than the Glooms for national actions
It's almost assured that this will be the case. The Glooms only have 19 of Occult.
that still doesn't make the Glooms useless just because they might only be useful for Personal Actions. For starters, we might be able to improve their stats, and even if their personal actions need higher rolls to give us good stuff, that doesn't make them a waste of time
Not all heroes can be improved. They'd need a Personal Action for it and they may just not have it. Just look at us, we're unable to improve our Occult Score despite really wishing we could (and this is even after getting the Manual of Witchcraft and Alchemy).
In any case, this argument basically boils down to:
-Even if their Occult Score is low we can get it higher.
-Even if their Personal Actions need high rolls they still give us good stuff.
For the first one, this basically means that they won't be useful at all until 2-3 turns later (at best) and by that time we will have Grunkle Mal. And the second one means that we will get said stuff randomly and infrequently since they need high rolls.
They have personal knowledge of other dimensions
Marco will have it too you know, same as Tom. And I really doubt they'd have a +X to exploring other dimensions trait, so I can't see any reason to think that the Glooms will have something like that.
and they'll probably be useful when we unlock our second Occult action.
This is basically saying, "If we recruit them now then we may be able to use them 4-5 turns later". That is almost a year IQ and by that time a lot of things could have happened, like the prophecy, so, and without trying to be rude, I don't think it's a good enough argument, to be honest.