User blog comment:Adsper/All Possible Mobs/@comment-75.111.239.208-20180619032536/@comment-6040659-20180624170319

First off, Brachiosaurus should be the biggest sauropod we have. Gigantic titanosaurs would probably be bad for the game, as their gigantic size means that you'd be lagging a crap ton.

Secondly, it's not confirmed that carcharodontosaurines were able to hunt in packs. Yes, there were big bone beds; however, it's entirely possible that these were depositonal areas, where dead individuals would be dumped by water or erosion. Even if they did hunt in packs, they wouldn't have tussled with ~75 tonne behemoths like Argentinosaurus; doing so would be suicide.