Kupp just looks a little slower to me. He lacks that burst off the line, winning his route almost immediately with split second quicknes in tight space. He didn't look slow in his fist few games this year and was putting up great numbers then. I think it is obvious he has aggravated something and is struggling to play through it, at least to some degree. The dude is a warrior. I suspect he will come up huge when the Rams need him most, gimpy and all. In the meantime, good thing the Rams found Puka, who honestly looks like Kupp in many ways, despite being a different type of receiver.