well sooner or later theyll need to have a consistent singer. For the sake of live shows.
The way this goes, well hear so and so from the album they did only a year later to have another so and so do their album. Itll get to the point of "can this singer really give the old songs the performance they deserve?" That sounds harsh and demeaning but thats how it goes. Some singers have their strengths and weaknesses.
Say you pick up a Kiske like singer, would they sound right with Immortal? It would be an interesting take on the Lance Era but you potentially fucked over an entire CD of anthems.
But Pyramaze knows what its doing and in the end, will do whats best.
after all i am just speculating, and the kiske thing would be amazing...