I haven't been to a Brawl tournament in about 20 months, lol. Too much school work for me, and too much money, lol.
That's pretty funny somebody didn't have all the characters. You have to play what? 350 offline matches. I did that within the first week of having Brawl... >.>
Our clan we just used anybody on the roster. I couldn't imagine being forcing people to play one character, especially a character as fundamentally flawed as Link (in any smash game, really).
We actually had a random clan match with a bunch of scrubs, whom none of them won a single match online, lol! We faced some of the Play 2 Win folks, which was close and pretty fun actually. Those guys weren't too bad. Of course, we are talking about Brawl's lagline!
My specialty or best skills in each smash game is different. It is very odd.
In Smash 64 with my first main, Mari,o I can hit dead on with his fireballs, and I can setup a good approach. With my other main, Captain Falcon, I can space fairly well and can time out my opponents fairly easily. My close range game sucks because I can't combo too well, and I can get combo'd pretty easily.
In Melee with my main Fox (and my secondaries Ganon and Captain Falcon), I'm actually a close range specialist. I am surprisingly really good at close range combat, and I can rack up some pretty good combos. Ironically I tend to play pretty defensively in an offensive game in Melee; my spacing is pretty good, and my overall defense anywhere is pretty good. My long-range offense sucks, and I'm working on improving my mid-range fighting skills.
In Brawl, my long-range offense with Toon Link 3 long-range specials, his zAir, and his grab is how I win matches. If I can't win the long-range battle, can't force my opponent to approach me, or I can't create a defensive short-range opening against my opponent, I lose. If I do any of that, my long-range offense paves a way for my short range offense. My mid and long-range defense are good, but short-range I'm well below average. Ironically in such a defensive game in Brawl, I play a very offensive-based game. I live and die by offense, lol.
But yeah, like you I use everybody on the roster to practice with and to get a "feel" for. I try to imitate the best. Once I get done with college and whatnot I'll probably focus more on each smash game and try to improve. I've been teaching my brother (who has ridiculous reflexes) and my girlfriend how to be better at Melee and Brawl, and they've been coming along, but are far from finished. My brother has reflexes that make me envious. His reflexes and speed of hands could allow him to win at any sport or game, period. In Counter-Strike, he's top 20 on like 10 servers with thousands of members because he is so fast and has such a vast understanding of the game (albeit he plays mostly zombie escape servers).
Ironically though, I hate sports game until I got Madden 11, and found out I **** at that, so I've been playing that recently semi-competitively. I'm real good at 3v3 in Madden, especially with a particular group of friends. Together we've won something like 300 online matches straight, including several games where we won as time expired, lol. Some people actually refuse to face us now because we're able to counter everything they do, lol! It's too bad I ain't that good at smash... >.>