Fowler and Bourn aren't all that similar. Bourn's game depended entirely on his speed, while Fowler can actually hit and has more on base skills. Bourn has a career 8.4% BB rate, .332 OBP, and .093 ISO. Fowler has a career 12.3% BB rate, .363 OBP, and .149 ISO. Sure, he benefited from Coors Field (though he did put up an OBP over .370 as an Astro) but he has more offensive skills to fall back on than Bourn had/has. Just hopefully he doesn't go back to being terrible in CF.