I definitely agree with that. Once you can closely examine the rest of the roof (especially in the rear at the roof/quarter panel seams and rear window, you should have a better idea of what you're facing. You might be looking at a roof re-skin.
True story: Around 87 I bought a 69 Charger that the vinyl top had been removed. The roof had what appeared to be surface rust on it. I very carefully media blasted it and found where the seams had been was nothing but Swiss cheese. No replacement roof and because I needed the car on Monday since it was my new daily driver, I ended up using a liberal amount of Tiger Hair on the seam areas, filling all the holes in. Got it smooth, primed and a couple coats of paint on it. This was going to be just temporary until the roof could be replaced. I ended up parting the car out in 96 as the underside rust just made it not safe to drive. That roof repair job was still holding up, no leaks and still looked good.
