The main argument for sending him back has been confidence. But what does confidence matter when he gains it by reverting back to instinctual play? What he gains by scoring again he loses by falling back into his old play style.
But, OK. At this point, I'm actually curious as to how does in any context. Send him down. See what happens.
I think that's a valid concern, and probably a big part of what seems to be steering management away from sending him back to Calgary. Unfortunately.
It may sound like "excuse-making", but i think there's a real underlying truth to the concerns over the way Calgary did/would likely continue to "develop" Virtanen.
The reality i think, is that if Calgary were to get Virtanen back...they'd be plenty content to just slot him in on an island on a "2nd line" where they know he can score at a 40g pace or whatever largely by himself, playing that "instinctual style" without really "growing" his game at all. And those goals, they know will help them win games.
I just don't have a lot of confidence that the Hitmen are a strong "developmental" organization, for Virtanen at least. Part of that is on Jake for not being entirely self-sufficient in his development i guess

...But the London Knights with a track record of strong
development priorities in addition to the winning, the Hitmen ain't. I definitely see the concern mentioned here, if Jake were to go back to the Hitmen - he'll end up following the path of least resistance to his 20g or whatever, from a "2nd offensive option line", and that's probably just going to be more of the same and not a lot of "growth".
Unfortunately, the Hitmen have their claws into him and have good reason to want him back to score goals for them in a playoff push, any which way he can do it. They have no particularly vested interest in working extensively with Jake to expand his game, when they can already get the goals they're seeking out of him "as is". If it were like the Draisaitl situation last year, where the Raiders were out of it and plenty open to trading away someone who could help them win...it'd be an easy swap and an easy decision. But that's not the case.
I think it kind of leaves them stuck between a rock and a hard place with Virtanen now. The NHL isn't a great option, he's not going to get the minutes and the opportunity to explore outside of his comfort zone and get creative - but they'll have direct control over what they have him working on and trying to develop in his game on and off the ice. The Hitmen aren't a great option, though he'd get the minutes, there's a real fear that very little "growth" would be effectively nurtured, and they'd be relinquishing the ability to teach, monitor, and steer his off-ice training as well (which was a noted problem that seemed to frustrate Benning when Jake showed up in Utica "overweight" and not trained "properly").
Cruddy situation.