At gear level 8(or 9 for some toons) you see an actual distribution of speed amongst the highest damaging toons. This, along with proper speed working, leads for characters like Poe and ST Han being next to useless in the speed meta for protecting glass cannons. Consider that at speed 142(or 144 with Han + Ackbar) Poe goes after my entire dps speed team.
RG taunt is out of turn, meaning that speed can be irrelevant, has a huge HP pool, stun, and has no real taunt CD(so even with removal a la humbling blow it can pop up next attack). This makes him ideal in a meta where two assists, one stun(one with a specific NS setup) and potentially one turn meter down all happen before even the fastest taunts.