Am I the only one who thinks that Luigi Mangione is not the actual shooter?

Am I the only one who thinks that Luigi Mangione is not the actual shooter? I have been following this case very closely and something isn't sitting right with me. Here is a guy who had intel on the CEOs whereabouts before his assassination, proven by his writing "Deny, Defend, Depose" on the bullets. Gets away without getting noticed, but leaves a Starbucks cup behind?! Not to mention is caught on camera in a near by Starbucks, wearing a different outfit and showing his face to "flirt". I would imagine a premeditated murder done at this capacity, the killer would not have left behind any evidence. something isn't adding up to me. AM I THE ONLY ONE?