I would say the 2nd segment (2.4% CLB requirement) would be the most restrictive part of the whole engine-out procedure or SID.
Maybe .. maybe not.
So far as obstructions are concerned, any segment can be limiting for a particular takeoff (depending on just where the rocky bits are) and the tricks we adopt will follow from which segment is causing the problem.
So far as WAT limits are concerned, the limiting segment may well be reasonably consistent.
Two different considerations, however ...