cannon upgrade

Several questions really: 1. Cannon upgrades are 1/3bikes so if I had 9 jetbike + a warlock on jetbike can I 'cannonise' the warlocks and 3 others? 2. Same as Q1 but what if I have 10 jetbike + warlock is this now 4 + the warlocks? 3. Farseer on jetbike plus his warlock bodyguard, can they...