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Miwa is like 16, a bit early to call her late bloomer, no?Miwa has a solid all round games with quality shots rarely seem at players of her age. But she doesn't have a killer shot that scares her opponents.
Tomo, started with super fast backhand (flip/drive/loop/punch) as his killer shot. His game at that time was unbalanced with forehand his major weakness. At the early sage of his table tennis career, most pros, even including top Chinese ones were shocked by his devastating backhand lightening quickness. When Tomo added quick shots down the line from the backhand, even Ma Long, FZD couldn't handle it. That's why he scored a few eye-catching victories against these heavy weights. Once Chinese analyzed his game and explored his weakness, his effectiveness against them went down markedly. Of course, he has also been busy developing his game, trying to make his game more balanced and he succeeded in good degree which is why he still remains the threat to Chinese, just not as effective as before.
In summery, Miwa is a late boomer (compared to Tomo) due to lack of killer shot. Tomo, blessed with a killer shot was an early bird. Which sibling can go far, early bird or late boomer? Will be interesting to see. But I'm leaning on Miwa.