I'd say it looks like the dropout wasn't heated to a high enough temperature... I would trust a properly done bronze repair but as cyccommute pointed out the original crack is still visible which leads me to think that the filler metal wasn't molten enough to flow into the crack. I would use a large welding tip or a small rosebud to do this kind of repair on a thicker piece of metal... I mostly braze copper and brass for my work but brazing principles are still similar for steel.