Do I have to equate clock and Data Bus propagation delay for Transmission Lines?
If distances are very short i.e. no delay then clock is exactly referenced in time to the data - there should be no problem with this scenario. On the other hand, if the delay to both clk and data is 50ns then neither should this cause a problem.

Giving precedence to the clock timing-wise sounds like a recipe for disaster and should be avoided.

Maybe there are some stupidly obvious things I have missed?