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Are you expecting Pena and Gonzalez to reproduce their 2007 seasons? That edits the analysis far too much, to include Gonzalez' pre-peak 2007 and Pena's age-30 2007.
You might as well compare Cliff Lee's last 3 years -- he ERA'ed 72 in 2007 -- to Fausto Carmona's last 3 years (since Carmona had a great 2007). Wow! Carmona is surprisingly close in ERA+ over that span!
No way in the world we use 2007 to assess where Cliff Lee, Adrian Gonzalez, or Carlos Pena are now.
If Pena could OPS+ 172 like he did in 2007, I'd want him, no argument. He can't. He's going to be lucky not to decline further than he already has.