No summoners have the slowest start for dps, but in the end of a boss fight we have the highest. I've recently done a CM run, 3 summoners, 1 bard.. after the 3 summoners put up our dots, we ended up skipping phases of the boss fights. Or try 2 summoners on garuda story mode, I've seen her because of the dots do 1 teleport, then teleport to the middle and destroy all the rocks. The longer the fight the higher dps is from a summoner, on trash fights black mages and bards are better, instant damage.

Now it is true, what we should have is something that, when our dots crit our pets get a quick buff, like a 3 second damage buff, just to give us something to rotate in, OR a buff that if say Miasma crits, Enkindle timer dropped by 10 seconds, when Bio crits, our pets 4th ability dropped by 10 seconds, and when Bio 2 crits maybe our next Ruin 1 spell will be instant with no globlal cooldown.