I think I found your confusion. There is no such thing as "the pool wins the block". Either miner 1 or miner 2 had to have solved the block. Your scenario 1 is in reality your scenario 2, minus that "pool wins the block" stuff. If both miner 1 and miner 2 are mining with equal hashing power and equally submitting shares, then they've each contributed exactly half the work necessary to solve the block. Therefore, they're each going to get 12.5BTC.
So basically what you are saying is that it is only possible for a single hasher to solve a block if it is just their shares that solve the entire block.
That would imply that a solo mining pool is a fraud as this will NEVER realistically happen with the hashing power in the hands of home miners.