Icebox plays different to abyss though, and the no duelist comp plays a different style to the reyna comp. Reyna isn’t the best duelist on Icebox because the default jett comp is better, the point being made in this post is that there’s an argument for Phoenix being better than Jett on the map in that slot.
The point made in the post is that phoenix is the best duelist on abyss, which think we both agree on, but I don't see phoenix bringing enough to the table that a kayo couldn't. A no duelist plays differen than a Reyna on icebox because Reyna is a very unique agent, but kayo is very similar to phoenix but with upsides. Phoenix has a place in double duelist, but not single
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