That is an interesting thought, I wonder though if it makes it a “harder” sell that the group gets a ship to leave without any piece of the chase. As your edit stands, they go down the pipe and later you see them in a ship. One can conclude they used the “sewer” to get out and get DJ’s “borrowed” ship.

If I recall correctly, it is just Finn and Rose at the stables … so by having the chase cut how can it be explained or even assumed in a some what natural sense they meet up with BB8 and DJ.

Again not trying too shoot things down so quickly since I am too thinking out loud regarding it. I do understand having those moments may help motivate Finn a bit more and naturally before he makes his full dedication to the cause.