Official GW 40K Errata and FAQ (7th edition link on page 7)

[manrogue]

Hi guys
"Some of the rule arguments i read on dakka are comical at best, face palm worthy at worse. Worse one i have read recently is putting your Comander with a drone controller with a Riptide (MC) and 2 shield drones (Are part of the unit and not wargear which then makes it a 3 man unit) to make him T6 (majority toughness) and the drones BS5..... Technically legal but so broken and not intended."

was looking at this and it is not legal as you can not join a MC as it is a sole one unit, so this idea is not legal, otherwise I would join a Haemonculus with my Talos.

It is technically legal on a riptide with missile shield drones as drones count as members of the unit, so with drones it is actually a 3 man unit. As I say a mistake on there part and will be faq'd.
Edit- deleted multiple posts, post 6 times for some reason! Stupid new phone!