While I wouldn't mind that much him returning to Kloten, I'm not sure it's the best path for Reinbacher. The defensive part of his game is already solid, it's the puck handling and offence, especially on the PP, that need to be developed
Last season, despite being the best defensive dman and most productive at ES, Reinbacher did not play on PP1 with all the imports but on PP2 with the Swiss players, the Swedish dman Jonsson did. And if you look at it, the imports were the one creating the offence:
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What would prevent something like this from happening again this year? Kloten does not owe the Habs anything, they have to fight to stay in the main league. If Reinbacher plays in the Habs preseason camp, he might also miss Kloten's camp and lose a PP spot to a player already here, it happens often in the SHL
The advantage of a team like Laval is that you control the parameters, it IS a development league. If Reinbacher isn't generating much offence on PP1 after 5 games, they can keep him there anyway. I don't known how good Kloten facilities are, are they like Rogle or way less good. In Laval, Recinbacher would have access to the Habs facilities, staff, he could have a billet family
This might be professional deformation on my part, but, for an expriment to work, you need to control as much parameters as you can and leave as little to luck as possible. I just don't see how Kloten becomes the preferable path when you leave so much of Reinbacher's development to things outside your control