Personally, I wouldn't even include those support locations, gap or otherwise, unless you believe that under normal operating conditions the pipe will settle down onto the supports during operation - i.e. displacement is equal to or greater than the gap at these particular supports locations.

Generally speaking, you do not need to model shoes into CAESAR, unless you believe that the shoe has an anchor or guide that is applying (significant) moment to the pipe.

If you're attempting to perform an analysis on what the stresses could have been within the pipe before this failure, then you should consider anchors that have sheared off as your biggest culprits in this matter.