The best argument for keeping both Chase and Higgins is to go back and look at how long it took and what it cost to replace Houshmanzadeh.
First they threw his money at Coles, who immediately went to crap.
Then they spent a second round pick on Simpson, who busted, and a fourth on Caldwell, who was meh.
Then, of course, there was Batman.
Finally they spent a third on Sanu. Yay!
So it took two failed FA signings, three draft picks and four years. Everyone is a cinch to replace until they leave. Then we're all singing Joni Mitchell.