A spinosaur salt gland may sit above the eye. Why plausible?

Answer: Short eye-nose route

Short eye-nose route ✓ — Short eye-nose route fits the proposed anatomy. The spinosaurid paper argues that facial changes shortened the distance between orbit and nostril, making a supraorbital gland with a duct route plausible. The counterintuitive point is that, under this interpretation, face shape can constrain plumbing.

New teeth growing in — New teeth growing in is a real dinosaur skull issue, but it does not explain a salt gland above the orbit. Teeth tell feeding and growth stories; a salt gland needs a secretion path. Being in the same head does not make the two systems solve the same problem.

Stronger neck muscles — Stronger neck muscles point behind the skull problem. Muscle power can explain posture or movement, but a salt gland needs space and an exit route for fluid. The surprising constraint here is facial architecture, not pulling strength.