Yeah, maybe, if that was an option, but it is not. The Steelers have to make a decision on Heyward by May 3rd. If they pick up his option, then he plays this season for 980k with a guaranteed payday of $8.4M (it is guaranteed until the new seasons starts). Or, you do not pick up his option meaning he can play for 980k and force you to tag him or hit the market.
Sorry, not much leverage there. I think you have to pick him up and then you are negotiating with a guy slated to make $9.4M for 2 years and if you fail to extend him this offseason, his price probably goes up.