Nope. Obito only becomes tangible when he is about to warp the opponent, and can easily become intangible to evade any incoming threats as seen when he
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the same would happen to Kabuto if he tried this. If Obito gets close and Kabuto tries to bite him with his snake, then Obito phases right through it and touches Kabuto instead.
Why would he have to jump away when he can phase through the snake and just touch Kabuto instead? Why would he even need to phase when he can touch the snake and warp Kabuto away like that as they are physically connected.
He can sense Obito coming but it won't change the fact that once he's touched, its gg and he can't do anything to prevent this from happening.
Again, he can sense him but he can't stop him, he can phase right through all of his offenses, touch him or his snake (which is connected to him apparently) and warp him away.
Obito doesn't even need to try and take him by surprise since he can phase through anything and everything Kabuto tosses at him. This barely qualifies as mid diff considering Kabuto can't hinder or hurt him.
Did they find out his 5 second time limit? No. It took Konan a long long time of studying Obito's abilities to figure that out, and she was always near him since they were in the same organization. Kabuto has a far less time limit than she did, and he isn't going to figure it out via his attacks as he can't ever force Obito to that point.