#1 AJ Styles (Will not Benefit):
This might come as extremely shocking, given how AJ Styles' WWE run has turned out so far. However, there's a reason why Styles might not be able to thrive on the flagship show. After Styles arrived in WWE 3+ years ago, he had a decent feud with Jericho.
After that, he was catapulted into the WWE Title picture. The feud was quite disappointing for Styles as not only did he end up eating two clean losses against Reigns, but the Big Dog also got the best of Styles during the build up.
If it wasn't for the Superstar Shakeup and Smackdown Live, Styles would have probably been a mid-card talent at best. Fast forward to the Superstar Shakeup 2019, Styles has returned to Raw and has been immediately inserted into the title picture. There's very slim chance of him defeating Seth Rollins next month, as the Architect has just won the belt less than a month ago.
Moreover, he is rumored to square off against Drew McIntyre at Extreme Rules in July, who is expected to become the top Contender for the Universal Title in few months. So, there's a high chance that Styles spends the major part of this year taking losses.
Raw's roster is filled with Top Stars like Seth Rollins, Drew McIntyre, Braun Strowman, Baron Corbin (who WWE has been trying to push hard since last year) and part-timers like Brock Lesnar, Triple H and The Undertaker. So, seeing Styles in a better position on the card, as compared to his placement on the blue brand, is highly unlikely. He can be a solid upper mid-carder but the change in roster might not have been in the best interest of the Phenomenal One.