What? Why would it be lower benefit? You're completely disregarding the increased bleed uptimes.
Being very generous, if Rip has 90% uptime at the beginning of the expansion and does 20% of our DPS, increasing that uptime to 95% by taking Savagery (which I don't think is unreasonable at all) then that alone is a 1.11% DPS gain. And using more realistic numbers would probably be closer to 2%.