Is it just me, or...

[BSG]

Maybe you missed it:

Maybe I missed a few things, but do we ever know why Marius had Baal's soul stone, why no one found/killed/worried about baal until AFTER Diablo was dead, or what "mission" Tyreal gave Marius gave, to which he refers to several times? Why does Marius have visions in the beginning of diablo, anyway? Marius didn't appear anywhere in D1 or Hellfire.. did he?

I don't know, there's just a few plotholes that seem convenient for the LoD expansion.