(cont)
(5) Comey happily played the Washington game with leaks, memos-to-self and private meetings. He is no boy scout for sure...

(6) It is reasonable to conclude that Trump was frustrated with the slow pace of the investigation and that Comey could not publicly clear him. Comey's reasoning is suspect as pointed out in (4); and Trump's comments in this context, although clumsy and brash, could be read just along these lines instead of obstructing justice. 

(7) Despite Trump's clumsy and brash un-Washington talk; we have no evidence that he interfered in the Flynn or Russia investigation. In fact we have statements that he was happy for associates to be investigated and hoped Flynn would be cleared (without every acting beyond this...)

(8) Again,  Trump arguably acted inappropriately in some instances and  through comments of Comey's FBI might have put pressure on him. But there is no evidence of interference or that Comey felt the need to immediately report "impeachable" behavior.