20 ball rallies at 3.5 are pretty damn rare. They are rare, in fact, at the highest levels of the game. I don't think it's realistic to expect that kind of patience, shot tolerance, and point construction from a player at this level.
I know players that look like 4.5s who are 4.5s. And I know players that look like 2.5s who are weak 3.0s. I do not, however, know any players who look like 5.5s who are from Iceland. I'm sure they are out there; I just don't know any.