Basically Marius was a precedent for Pompey's rise to power & to an extent Caesars, also allowed the army to be used for politicasl purposes and so even though Sulla reforemed the Senate so that ppl like Marius would have less power, eventually the senate gave in and led themselves to their own destruction by allowing these ppl to have great long commands which were successful (makin the public like them) and in times of trouble giving them power, which pompey/caesar added to by using their armies (crossing the Rubicon etc.) to gain political stature (Marius's precedent)
Seriously, that was a baby version, and i cant believe u ppl dont know this stuff, read that books Asy wrote