Again, not arguing that he's not good. A 5-WAR expected player is very good.
I just reject that Bourn + Prado << Upton^2 just because the Uptons have flashier tools.
WAR Totals 2010-2012
2012: BP [12.3] > U2 [5.8]
2011: BP [5.7] < U2 [10.5]
2010: BP [9.0] > U2 [7.1]
Total: BP [27.0] > U2 [23.4]