Why marius reform early than expected?

[gakhongten]

Hi, I'm killing Carthage and they still have 3 settlements left (starting settlements that I need to take to trigger Marius reform). Then, boom, my family member betrayed me and Marius reform happened. The family member betrayed me, he got 4 eagles since I gave him these to increase the morale of the troops. So, do I need to kill him or bribe him again to use these legion numbers?

Also, why can't I have heavy catapult in Capua. I build the latest siege barrack. After the reform, I expect to train all possible unit?