If you look at the tweet closely, you'll see is what they are doing is moving Tavares away from the net front. So he's the one stealing Kapanen's spot, and they likely don't feel like Kapanen is the right guy to have in front of the net. As for the alternatives, none of them seem like options that might provide some value down there other than as a mobile screen, so Marleau is fine.
What I don't get is how Kapanen can't get a spot on the second unit. Ennis is getting his spot there, and I'd much rather have Kapanen on the ice for that. Hyman as net front is meh in the same vein as Marleau. It's not like I'm thrilled with him there, but I don't quite see a lot of good options either.