It's a bit Platonic, Bradford's statement, encoding, as it does, the difference between mere existence and a higher plane, giving a hint of Plato's contrast of the actual with the Ideal.
For on the one hand, we have David Ortiz, existent. Thing in the universe. Occupant of a portion of space-time. Detectable with the senses. On the other hand, we have David Ortiz, David Ortiz. Great thing. Ideal Designated Hitter. Big Papi. Team Leader. Object of incredulity and awe.
So really, there's no pressure on Big Papi at all. All David Ortiz has to do during the pennant race is not exist, but transcend existence into the realm where his true self -David Ortiz- lies; that is, for Bradford, it's not enough simply that David Ortiz- that thing that answers to the name 'David Ortiz'- exists, but that the David Ortiz that exists also exists as David Ortiz.
What I love best about philosophy is the clarity it affords.