It does mean something. 100%. If only that it means he is a "late bloomer".. You just contradicted yourself in your own statement.
Felipe Melo had 1 great season at Viola too (at 25 as well

). Turned out it was just 1 great season.
There's a reason big teams are wary of players in their mid-20s who have had just a single good season.
No one is saying he won't turn into a world-class midfielder, or that he wouldn't be a good buy for 25 mil... but people acting like he's already world-class, or that he's the answer to Juve's problems... or that he's some kind of great all-around midfielder... he's had 1 great season. That's it. And he's shown to be quite one-dimensional at that. His passing and ball-skills are atrocious right now.