So I went back and read some of the SeeD information, and I had forgotten how a lot of it goes. I forgot that Squall and a couple others already have Guardian Forces before going to tackle Ifrit. Fortunately, Zandelle can still meet Stray as part of the exam. I'll work out a low-level mission that Zandelle would have completed later, probably a recon, as that is the secondary requirement before the field exam.
Zandelle is not going to be much of a spell caster. In Final Fantasy VI the only spells Stray gave were Muddle, Imp and Float, so those are what I'll leave Zandelle with using once he gets a GF.