The main thing with me as I see us being a little heavy at end if we acquire Quinn. So even if we don't include Charlton as part of the trade, we could dangle him to see what we might could get. Maybe it just allows us to trade up some in the second round if needed, or maybe we could get an extra fourth to use. (I can't see his production warranting much more than that.)
We could keep him an dangle Armstrong instead, but I'm not quite ready to get back a fourth-round value on a fourth-round investment we just made last year. I'd rather see if he turns into more than that.
Charlton's value is clearly less than his draft status right now. The gamble you take in not trading him now is that he'll continue on the path he's on and have no value.
Of course, we could just do that and see how it turns out. With Crawford and Hyder both having the ability to play inside, that could technically leave us with four ends to rotate (Quinn, Lawrence, Charlton, Armstrong). However, looking at the DL as a whole we already have eight keepers (Lawrence, Charlton, Armstrong, Hyder, Crawford, Woods, Covington, Collins). If we add Quinn, we'd have nine. Any other additions in FA or the draft, put us at or over the limit and someone has to go. This isn't including Daniel Ross, because I don't think he's a keeper. So IMO, we're likely going to have to eliminate at least one from that group of keepers.