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Love the optimism, but I don't see it.  Tillman's control and breaking ball are far, far superior, as is his statistical track record.  He's also dominating Triple-A while Cortes is scuffling, and Tillman's a year younger.  Cortes is a great arm and I'm really glad the team picked him up for dead weight, but Tillman's a consensus top-5 pitching prospect in the minors, while Cortes is probably a top 10 prospect in the Mariners system.
Coming into the year Cortes had some hype behind him, but he's regressed.  If his command comes back, he's got the upside of a #3 starter, maybe a #2, or a lockdown reliever with a great fastball.  Tillman's got ace potential.  As with all prospects and future projection, there's a non-zero chance that Cortes contributes more in the majors, but Tillman's the much more valuable commodity right now.