honestly invoker isn't a carry unless he snowballs, in the same sense that ns isn't a carry but can end up solo'ing the game. Invoker loves levels, and when he gets a level advantage, he'll press that level advantage since he's one of the few heroes whose spells scale per level up until the reagents are maxed.
Invoker's usually played in a 2 position, he'll want that midas, he'll want his phase/treads, and he'll probably want either a force staff, blink, euls, or something of the sort. But really, he's not the kind of hero which flash farms for levels or sits in jungle for a while. After his core (or even before), he'll look into ganking, sunstriking, jungling, anything to get him exp and to keep the enemy heroes down so he stays effective. He's not a hard carry, he's not even really feasible for a tri-core, he's probably the closest thing dota has to an AP carry.
