The thing with Burks is his pre-draft testing numbers showed he was not explosive and that's been the case so far. But the Cowboys liked him coming out of Arkansas and he could be worth kicking the tires on.
I have also seen the videos on YouTube saying the Cowboys could send a 5th to Tennessee for Burks. And why not? Current projections have the Cowboys at ten picks in next year's draft: a 1st, 2nd, 3rd, 4th, up to four 5ths (their own and four comps) and two 6ths (their own and a comp). They currently lack a 7th which goes to the Lions to complete this year's round one trade down.