If they're auditioning Tinordi for a #7 depth position going into the playoffs, you gotta think they're hoping to see more from him like this. In isolation I'd like to see him finish his year in Hamilton and put on some bulk before trying to make the team next season. But I can pretty easily see him ending up playing some games this year. Maybe a lot of them.
What is the team missing at the moment? The one guy they need but don't have, in spite of their loads of consecutive wins? They need a big defensive defenseman who can play physically and steady the PK. If Tinordi can play the role, big if, and add 5-10% to their currently non-clutch PK they are a much better team.
Long term I would expect Bouillon to sit if Tinordi works out. Bouillon has been solid, but if Tinordi can play better, more physical, D, especially on the PK then he and Diaz should be in with Markov, Subban, Gorges, and Emelin. Bouillon has looked good at times, and he is physical relative to the rest of the guys they have, but adding Tinordi would make opposing players take the habs seriously when entering the zone. Each pairing would have someone (Emelin, Tinordi, Subban) who can throw some serious hits, though Subban is a little borderline. Bouillon is very strong and he can hold his own but he's not exactly scaring opposing forwards.