WWE was not happy about Ring of Honor outdrawing NXT in Texas a couple weeks ago when they went head to head. WWE has also lost some face as there continue to be ROH guys that WWE expresses interest in that end up signing with ROH instead.
Part of the problem is that WWE is so used to everyone wanting to be in WWE so bad that WWE doesn't think twice about the hoops they make talent jump through. However, with the uncertainty over when the signings will take place coupled with guys not wanting to wait around, things are a little more complex. It's also important to remember a WWE developmental contract is much less than what some of the bigger names in ROH are already making.
Jay and Mark Briscoe chose to stick with ROH, as did Roderick Strong. Strong, like the Briscoes, garnered WWE interest but was told he wouldn't be signed until January. At the time he re-signed with ROH, January was six months away and he didn't want to be in a bad situation if WWE didn't follow through.
Meanwhile, WWE continues to be interested in The Young Bucks but it looks like the Young Bucks are signing with ROH. The Bucks are being offered almost 50% more than what the top highest paid full time contracted ROH guys are making, so going to NXT right now would definitely be a pay cut for them.