I think Dinu has quick hand and, footspeed ,good defence and ,the right instincts. He has only had 6 fights , those you mentioned Hellenius 15,GLazkov 9 and ,Pulev 15, may be more advanced at the moment we shall see how things turn out in the future. Fury too has 15 fights under his belt, I am not comparing Ridu to the other Europeans ,I havent seen enough of them to comment ,but he appears to have more natural ability than Fury to me, whch makes a nonsense of your claims that Brits are biased towards their own countrymen. Dinu is 6 foot 5 inches and weighed 231 1/2lbs for that fight, how big does he need to be? Its also nice to see a heavyweight that isn't carrying 20lbs of lard around his waist.
Are you by any chance a hater of all things British? :think Fury has slightly faster hands than Helenius, i think that's obvious. Helenius throws to hurt, Fury often throws lightly to score points & conserve stamina.
Helenius is a slow starter though and it might cost him at some point. Despite decent success in the amateurs, the pro ranks are far more suited for him as he likes to be conservative, look for the openings and figure his opponent out over the 10 round distance.