No way is it irrelevant. Smith was a Titan until a miracle 11th hour increased offer by the Storm, which history has now told us was outside the cap. Take Smith out of the team and you get the '08 grand final (juiced Manly notwithstanding).
Smith, Cronk & Slater are basically worth a 12 point head-start on any other team that has legit retention. So what would any team do if they knew they had effectively a points head-start every game? Defence of course. 90% of what Melbourne do is defence. They only have to recruit and retain players on that basis. The 10% of attack is basically a controlled, manufactured game to advocate the use of Smith Cronk & Slater. That's why the majority of the Storm's discards are useless elsewhere. At the Storm they're simply a tool, they have a narrow pre-defined purpose.