Quote Originally Posted by Lemuria View Post
The fact alone that he was able to do that is all the information you need. The only other person we know of to become a primal was Lady Iceheart, and she wasn't even a fraction of the same strength. Furthermore, he was holding Bahamut back before he even became Phoenix, and cast a powerful binding spell.
Don't forget, Thordan VII and The Knights of the Round, also were able to become "primals."

Either way, when it comes down to these different jobs, it's always hard to pinpoint exactly which one would be considred to be the strongest. Each one has something to it that we've seen or heard of through their respective storylines. The biggest would definitely be between BLM and WHM due to The War of the Magi.