Why is Minfilia so darn hot?

[dinnertime]

Which before he showed she was doing. If that's the case why was he even in the story when a primal is present. Plus both of those duties goes hand and hand. That's why she seems useless cause they both have the same role. One of them can easily do that. Using what you just wrote Alphinerd did BOTH jobs in heavensward to prove my point.

The 2.x MSQ has a lot of story lines involved (Mainly Primal investigating, Ascians, the one concerning the Crystal Braves and Ul'dah, an introduction to the Dragnsong War, etc), and Alphinaud is part of the Scions, so of course he'll be in the story. Besides, he is aware of Primals but he instead fortifies the Scions' relations with the city-states, so he did because of his influence and goals. He was more present with the investigation for Garuda however, but that is because the Scions were missing. With Coil, that's just it in his involvement in Primals... in ARR that is.

After that he never dealt with other Primals that much again, until Heavensward in which the Scions were missing again at the time.
While both of them can do it, that just means two brains are better than one to deal with it all.