Assuming Mayich is traded, Marrelli will be the top-pairing LHS d-man (with Mews) for the 67s this upcoming season. If Sirman is traded instead of Mayich, Marrelli maybe bumps down to the second pairing. Personally, I don't think exposure is Marrelli's problem insofar as the draft is concerned; he played a ton of minutes for the 67s last season (and played on the 3rd pairing for almost the entire 2022-2023 season as a 16-year old rookie) at ES, 2nd PP unit at times, and served as one of the core PKers. He also played on the Canadian U-18 team (and played well).
Marrelli's problem is likely that he is a jack of all trades, master of none. And he doesn't have great size for one of those sorts of d-men. He lacks the size/strength (for now) to really muscle opponents around in the d-zone. He works his ass off and he's good in all facets of the game, but isn't really outstanding at any one thing. Personally, I think he's been a better d-man for the 67s than has Mews, in terms of reliability, consistency, and ability to play in any situation.
Would be interesting to get a scout's take on Marrelli.