Could be wrong, but I don't remember a maximum total, spread among a bunch of contracts, that can be buried. I remember that idea being floated... but not sure.
I do know, for sure, than it's only the amounts over $925k that count against the cap when a one-way deal is in the minors. For Johnson, it isn't.
I think there might be vet restrictions in the AHL, ie like max 8 or 12 guys with x amount of pro games or something like that. No cap though.
Anything that goes on the cap is purely based on the individual contracts.