If what Bear said is true then I assume Great is the strongest character in the series along with Bear of course. When Sword mentioned Burner as the last child I think there is more people like Burner who were created to kill Great. So I don't think Burner alone is strong enough to win against...
@Mizumachi
Orion said that Burner is the wrong person because she is a woman. And the one they are looking for is a man “probably Great”. And it seems that both Great and Burner are from the Bear family hence even though Burner was the wrong person she still has the royal blood