Delay in Production after Spud

My family and I own property in the Hollywood Unit in Reeves County and have leased with COG. Five wells were permitted last year and we just received division orders on the first four. I’m curious as to why the fifth well is being held until 2019. It was spud in January I believe and my understanding is that it was on the same pad as two others. Is this normal to not frack this one when they completed all the others? I’m sure there is a logical answer such as safety or something. Just curious

Moved this over to Reeves county. Someone there may be more familiar with the area.