David's Trap

elaborate a wee bit. trap for who and how is he gna spring the trap

Did you watch the video? A trap for the Covenant. That Planet 4 was used as a lure for a colony ship to provide David with hosts. That the Shaw transmition was David using her distorted but mutilated face as the visual. 

seems like a pausible therory to me. let me take it one step further. in the novelazation of alien covenant david contacts the weyalnd corperation after puking up the facehuggers. this could lead you to belive that david is in on it with the company for some reason part of a bioweapons departemnt. this would explain how david would hide planet 4 from the crews existence until they passed by it. even the neutrino burst seemed very planned out in its timing. literaly the minute the recharde sails opened, the nuetrino blast hit. now david wouldent be able to afect all of this by himself but the company who owns the ship certaintly could. this would lead me to belive that planet 4 was a trap but was set by the company with david as just one part of it.

More likely David would be drawing in more hosts. 

I felt like the Weyland Corp was somewhat involved in finding Planet 4, but with the transmission that David sent at in one of the shorts outside of the film, it sounded like he was explaining his experiments to Weyland Corp, but not actually sharing as if they were working together.  It felt more like he was just saying "This is all I've accomplished so far, and this is what I'm planning to do, but I don't need your help anymore."  Like maybe the initial plan was to collect specimens, do some experiments to see what we're dealing with, then bring it all back to the company for further study. Instead, David has found what they were looking for, but with his almost infinite knowledge and ability to learn more, he decided to take things into his own hands and move ahead with his own agenda now.

That extra information regarding Weyland knowing has been removed by Fox and re-written by AC.