So your "facts" that he had a losing record with the WORST lineup pretty much ever for 3 years is why he isn't a good fit for the "present NHL"? That is not support for your position. Tippett not being able to coach an old Doan and a team full of Tobias Rieders to the playoffs means nothing.
If that is your whole argument then is the Oilers having a losing record under Nelson all on the coach? Or perhaps the lineup?
You haven't proven Tippett isn't a fit for the current NHL or brought up any proof to support that Nelson would be.
Edit : Sorry if I came off a little condescending here