Dude, what's so funny?
Is that so hard to believe ? Is is hard to understand the fact that some people took a TrinityCore version at some point and made it way better than the "official devs" ?
It's one thing to work on an antique project (wotlk branch) and a kinda newer one (cata 4.3.4) at the same time and a completely different thing to work exclusivelly for cata 4.3.4. It's quite normal to progress more working on a single project than 2 different projects at the same time.
If you dont believe me, u can always ask me by PM to give you their server details and start playing there for a while and test things yourself.
If after a while of testing, it turns out that im not right, hell, i will specifically ask to be banned from this site/community.