The best way to know is to try it and see - a lot depends on how high your dps can push it, how long your healers can keep going for and how strong they can get their healing. After a few adds are up, you will start to take noticeably more damage from Ignis, and if your dps is low and heals are weak then you will likely get gibbed.
The strategy I use, standing in water but turning him to scorch the ground in one useable spot (about every other scorch) is a similar approach to what you quoted that allows you to kill off at least some of the adds, keeping Ignis' damage to a more reasonable level. You might try that if you find you have issues with tanks dying with the straight up burn approach.
Corpsicle
Fri Jul 17, 2009 9:07 am
