User blog comment:B214/High School DxD DX.4 discussion/@comment-202.83.172.186-20170811042212/@comment-139.167.2.106-20170825072559

Well it seems a straight forward pact to me. All Crom wanted was to get to know and fight strong dragons, particularly Draig & Albion. Seeing the void in Rias' team, he jumped to take Ise's spot. Rias team is still powerhouse with 3 Longinus level SGs and other strong members, thus the possiblity of her reaching farther in tournament and hence facing Ise & Vali is very high, which also Crom must have considered. I don't think Crom will be asking some bigger price/reward for the pact, as he is shown to be very simple natured powerful dragon.