I wish we could just get a jack theme that allowed all of our jacks. Ret is the only faction that keeps getting themes that only allow half of our jack stable (MKII it felt like every other caster's theme force only allowed Shyeel). Now that Ghyrrshyld is a religious icon, Ossyan is courting a Shyeel prodigy, and they've had to deal with a massive Skorne invasion it's just weird for them to still be that picky. From a gameplay perspective it just sucks having our five best jacks (IMO Banshee, Harpy, Phoenix, Griffon, Siren) constantly split up for no apparent reason. Plenty of casters would be happy to run a jack-heavy force that allows mixed-arms and I really don't see how it could be OP in any way.
I'd substitute manticor for pheonix but otherwise totally agree. It is really annoying to have a jack theme with only what 3 heavy jacks and a benefit that doesn't really benefit the jack casters (free upkeep turn one saves meaningless focus).