There's been a criminal civil war raging between HAs and every other smaller org that wants to expand (look at Blood Family Mafia specifically, Arab Power as well). HAs have lost some feathers in pretty gruesome ways. They're all older and neglected to replenish the ranks in order to preserve prestige. Street gangs didn't. If I'm competing in that world, I'm funding the underdogs until leadership trembles, then we make a deal. I believe we're at that point now. All those groups - including the Sicilians - have all been slowly invalidated and Angels are appearing more stable/powerful these days (even though we just outlawed their colours - but even that gives them prestige).