Yeah there's plenty of ways to look at it and I'm not going to necessarily dismiss any of those points. Martin does have the big game specialist tag (with big scoring impact) so he's always going to in contention for that forward flank spot.
"Lock" for the century this far out is a damn high ceiling for praise. Personally I'd think if he had another league MVP and couple more BnFs he'd be more worthy of that. Or did a mini (modern day) Ablett Senior and had a veteran year or two kicking 50/60 goals plus. If a non full forward comes along with multiple Brownlows and 600 plus goals, it would make that spot stiff competition. It might sound silly but there's 75 odd seasons left.
The problem with Martin, and it has always been his problem is we only really got 5 years of his best football. He took forever to reach that level, he reached it, spent 5 years up there, and then dropped off again. The other players on this list were at their best for 10+ years. Martin just wasn't at his best for long enough to seriously put him in these sort of conversations, just like Buddy would not be if he only played at his best between 2007 and 2011 and then dropped off.