Guys thanks for the great insight and trust me when I say I really wanna rank silk up. But as @Java_Junkie said, she already does so much overkill at r3 that adding another rank feels too extreme. I would love to be wrong tho so anything a bit more detailed would be just phenomenal. Regardless, huge thanks to any replies to the post!
That awaken Silk would look so good at R4. Does she need it, most likely not but which content needs any R4 right now. It would be awhile till R4 is needed for regular content. In BG most players will ban an R4 instantly anyways. Since they will ban your R4 silk you will have better defenders to use and if they don't Silk will just wreck the defender in seconds. An R4 Photon will always get ban.