Who are you again? An actual new poster, or just a new name?
He got what Edwin got - which makes sense because they provide similar value; however, he's 2 years younger than Edwin at the time of signing. If we project Santana at 3 WAR in 2018, 2.5 WAR in 2019 and 2.0 WAR in 2020 - he provides the Phillies with surplus value in the range of $15M.
It seems about right to me. Phillies seem to be making a move to contend now.