I don't suspect Ellsbury. I'm just using him as an example that we could suspect lots of people.
As for Ortiz's "return to dominance", he had a monster year against righties in 2010, much better than he did in 2011. In 2010, he in fact had a very strong overall year. In 2011, he made an adjustment to take lefties the other way. I don't think PED's help you do that. His power output stayed at the same, and it went down significantly against righties. I don't think PED's would help you against lefties but hurt your performance against righties. That just doesn't make sense. The fact is that once Ortiz got over his wrist injury, he has remained a big force since June 2009. You can suspect, but I think you are way off base. I posted in this forum in May of 2009 that Ortiz still had bat speed and that his obit was premature. Look at his overall stats from June 2009, not his splits, and you will see that he has been a very consistent offensive force since then. 2011 was not such a big bounce back season. He made adjustments to keep himself from becoming a platoon player, but those adjustments actually hurt his performance against righties.