I think that is pretty much a different subject. I was arguing that being a low-tier hero makes you a more well rounded player overall. Learning a character with a unique style is different from that, with it's own set of obstacles. (though I'd also say that often times, you have to have ingenuity to play low tier, which could indirectly help). I wasn't trying the argue that playing lowtier will help you specifically learn higher tier characters with unique attributes -- i.e. Being a master Mina player won't necessarily make you a master Voldo player, but it WILL help you be a master Soul Calibur 4 player
It's the same with unique character matchups too. That's a case-by-case basis.
But the things I'm talking about with low-tier using is using fundamental knowledge to your fullest advantages - blocking properly, punishing properly, using frames, using system attributes to your advantage, such as life bar, game clock, stun bar/guard break/soul gauge, using psychological tools to gain upper hand, etc. Those can be learned when using higher tier characters, but when using low-tiers, it tends to become a requirement, therefore you are more subjected to learning/using these tools. For example, alot of Ivy users I see below the highest level use her pretty well and are pretty scary enough. But they don't even use things like her good soul gauge game. Why? Because they don't need it; and they don't bother to learn it because of that. But what if they did? Their overall game would become that much scarier/stronger