wow, that's a good looking plant! it looks good clustered like that. much better then a single! it's a good proportion too - sev sizes coming up ladder like.
why fix it if it's not broken :)?
the smaller pot probably limits its size too - it can grow WAY bigger. if you feed it well and the mix does not compact too much - it'll just keep going.
do you know what's in the mix, when was it last xplanted?
i'll find a pic from fla ...this one is about 10' tall :)