Crosby's peak as a goal scorer isn't very high. He led the league twice, but overall has just 3 40+ goal seasons.
His peak as a playmaker isn't really all that legendary too. Even if we only count the players from his prime era, Thornton, Henrik Sedin and Backstrom are definitely more accomplished playmakers, with several more arguable candidates.
Crosby's strength is he's a very well-rounded offensive player who has aged very well (which has been helped by the league-wide scoring increase), but he has never been the best goal scorer nor playmaker in the world, which, in my opinion, disqualifies him from being 'all time elite' at each just based on his raw totals (I hope you don't consider Ron Francis a top 3 playmaker of all time).
In fact, if we multiply Ovechkin's career lead over Crosby in goals (272) by the average amount of assists per goal (1.67), we'll get 454, which is far more than Crosby's lead over Ovechkin in assists (337), which could be interpreted as Ovechkin's lead over Crosby in goals has been more significant than Crosby's lead over Ovechkin in goals.
In short, Ovechkin's goal scoring is arguably the best of all time, while Crosby's goal scoring and playmaking are both arguably top 5 of post-lockout era. Analysis like 'well, their goal-scoring is a wash, so Crosby scoring more assists is a decider' is really bad-faith.