Williams provides the Cubs a long-term under contract btm of the rotation pitching, his ceiling is that of a middle of the rotation starter. Right now, they have 4 starters locked up after this year and Williams happens to be the cheapest and likely will be more productive than Rusch. With Maddux, Wood, and Miller FAs, despite the large amount of money from FAs Maddux and Wood, it will become difficult to build a large % of the rotation thru FA in the same year. If the Cubs had the ability to trade someone of that value for a platoon player, it would be great. I don't see it. I don't see where the Cubs have the ability to even start the year with Z, Prior, Maddux, Rusch, and Hill their starting 5 until Wood gets healthy. A 4 man rotation is unwise, unless the risks of burning out a rotation in August is worth having Kearns face LH'ers, something I've haven't seen discussed regarding Jones. I think Kearns over Murton would be a more likely possibility than Jones/Kearns in RF. I feel Murton has better tools than Kearns on offense as well as a better approach and will be more productive, that's before factoring Kearns' injury history