Gunston wouldn't have made a significant difference. He's not a stand under the ball and mark the high kick forward. When the delivery is like how it almost always is over the past 5+ years and he doesn't have a tall, marking forward around him, he's struggles to kick goals regularly, especially against good sides. Same with Bruest. So the Geelong, Richmond and Melbourne games would have seen him kick maybe 4-5 goals in total.
Sicily would have pushed someone out of the side. Looking at the role he plays, chances are it was our best player this year who would have been left to rot in the VFL. Our defense has been solid for most of the year, so his inclusion isn't going to suddenly make our forwards lead and kick goals, or our midfield gain a leg of speed and some kicking skills.
Day has played this year and we still looked average expert for that outburst 4th quarter against the cheats. Against Richmond, while solid, we still lost by like 5 goals.
While these 3 players are all starters in this side, they're not filling the holes in our squad, unless, of course, Gunston goes against coaches instructions and leads; playing to his strength. None of the above names are mids with speed and kicking skills plus an eye for goals. None of those names are rucks who aren't dumb footballers or aging rapidly. None of them are 195+cm tall forwards who can stand under a ball at the top of the square and mark it.
Some Quick ball movement and overlap and Gunners some space to lead???? No Way. That sort of play would make 50% of coach’s positions redundant .