I think the appeal with Grundy (over Gawn) is that Grundy has a monopoly over the ruck position.
21/24 centre bounce attendances, 29 hitouts, (Kreuger had 0, Cameron had 1)
compared to Gawn
16/26 centre bounce attendances, 18 hitouts (Jackson had 16, McDonald had 1)
It's going to be tough for Gawn to be a top 3-4 ruck when he's in a ruck share (arguably this was known before the season, but it seems more prevalent than some were hoping)