Ohh, f**k, I wish I could.
The thing about character mastering: It mostly takes knowing the command and make good use of them. Anyone who gets to understand the basic purposes of some essential moves, has good chances of beating anyone who main that character.
We all know that SC has never been a "command challenge game." It doesn't require that much skills to perform efficient things like combos and setups. SC is very playable for that reason, it takes out the worries from the skill part. SC is mainly a metal, gamble/reaction game. Moves like Just Inputs are not that necessary to win against any character. The reason for that is; that nearly every moves has its way of being countered (crouch, dodge, jump, etc.), and are not guarantee to work all the time (Example: Asta's 66K > most Sig options, and one must play very different against any Asta player because of the potential of 66K being used during the match).
The other point about mastering anything: It mainly requires time. "Time is the teacher", and everyone has the same potential. Its just a matter of deciding how to invest in that potential, that's what makes some individuals stronger, faster, etc. than other individuals. There's no set limit, only what the game (in this case) provides.
Playing good and winning is more of a defensive matter also. A player's offense game will always be limited by their character, but a player's defensive game is only bound to change and adapt, just like water. IMO, the art of fighting comes in the defense. In order to apply one's wits, one must know what can be done. "Knowing is half the battle" (G.I. Joe).
Gambling vs reflexes: This is very simple...
Reflexes > gambling
If a player is fast enough to spot and act, they will not need to relay on gambling their way out of a situation. What helps reflexes in fighting are the character's strings of attacks. "If you know the next move's target, guard it, counter it, or punish it, if possible. Good gambles can not harm a player with good reflexes (Bruce Lee taught us that)...
...I got to go, Transformer2 is on the way!