I'm a sub 4 miler who transitioned to fairly serious cycling after my running career. The people posting about Rupp, Farah, Kipchoge, any other long distance guy-- no way. Those guys are aerobic beasts and efficient runners but such a suggestion fails to understand how important power is in cycling, even to climbing specialists. Long distance guys just lack power, even the relatively more powerful ones like Farah and Rupp. They might be able to climb a really steep hill well on a bike (which is basically like running) but that's the only thing they'd be good at.
You really have to look to mid distance guys since they have power and aerobic ability. Blankenship or Yorks. These powerfully built guys would probably make the best cyclists out of the top tier of runners. Centro is tiny with big power:weight but lower on absolute power so I could see him going uphill fast but he'd probably struggle at other situations like TT, small breakaways, or crosswinds.
To be clear, it would still take years of full-time cycling to get anywhere close to the pro ranks, and most of them would wash out along the way.
Mike Woods is the exception, not the rule.