You've developed an interesting legal presumption. May the chains rest lightly on you...
The only flaw in the ruling is the meaning of ‘exigent circumstances’.
There is no violation of the fourth amendment here. The police had reasonable cause, that being the smell of marijuana coming from the apartment. When they start shuffling around inside the apartment they blew it right there. That’s where the exigent circumstances come into play.
What they should have done is open the door, step out and close the door behind them.