That Time I Got Reincarnated as a Slime: Tensei shitara Slime datta Ken

[Munsu]

Yeah but...there was only a lack of magicules because the author wrote one in. If he hadn't written in the magicule absense, he wouldn't have had to write in two unnecessary characters.

Yep, which is why in the previous post I wrote "...that's pure writer's discretion by that point. I figure in part was to show that Rimuru was willing to sacrifice his lifeline to bring his people back if needed be..."

I guess it could also be used to show that the demons he summoned, for one reason or another, had his complete loyalty, or that the Primordial is able to discard other demons loyal to him (presumably) at will.

But in the grand scheme of things, don't think it matters much... quite an arbitrary event.

[Kraco]

I guess it could also be used to show that the demons he summoned, for one reason or another, had his complete loyalty, or that the Primordial is able to discard other demons loyal to him (presumably) at will.

I'd say that was the exact reason and, in fact, it does matter. The primordial demon has quite a bit of catching up to do, being a new character halfway through the second season. Things like aiding Rimuru to perform a big task like the resurrection is a solid way to make the primordial demon matter at all, not be forgotten immediately.