4th job Single Target DPS

Summon damage isn't directly added into the chars dps. This is how he's done all of his dps charts thus far.

As he explained earlier the deficit for turning octupus on is due to the lowered cannon shots per min because you are using that time to cast octupus.

Cannon shoots at 630ms. Octopus Summons at 810ms. You summon an Octopus about every 16 Cannons. (10.08s) In a minute, that's approximately 6 Octopus, and 87 Cannon Shots. The Octopi would shoot approximately a total of 113 shots. With a 1.18x Critical on Cannon, and I do not know if criticals affect Octopus:
1.18*130500% Cannon + 50850% Octopus = 3414%/s
As opposed to 1.18*2380.95 = 2809.521%/s pure Cannon

A single Octopus will do ~13050%. Cannon takes 8.7 shots to match that. Octopus obviously takes shorter than 5.481s to cast. It shouldn't be possible that Octopus is a deficit. It's fundamentally the same thing as Poison Mist. You spend 810ms to cast a DoT that does ~290%/s that lasts for 45s.