The 737 appears to have been stationary for approximately 20 seconds between lining up and starting to roll
and there lies the problem .
Just llistened to the audio , SW was clear to line up and take off
with the mention there was a heavy 3 miles out , if SW was not ready for an immediate take off he should have advised ATC. At 140 Kts you are doing 2,5 NM a minute .so from the time youreceive the instruction to line up until Vr you,ve got just over a minute , doable routinely by good professionals but you cannot taxi slow and waste 20 seconds standing still in this configuration .. That said this is a very tight clearance from ATC , not really to be done in LVP Ops. I would say.as the arriving aircraft cannot monitor where the departure is on the runway,