Donald has struggled early, but it is hard to believe the Phillies would make such a deal. If they see the guy who pitched 208 innings of 3.03 ERA baseball for the Dodgers in 2007, maybe. But Penny is at 6.04 ERA in 149 innings ever since, and it is hard to see Penny as enough of an upgrade to warrant dealing one of your best middle infield prospects.
Zolecki also reports that the Phils don't seem to view Tom Glavine or Vicente Padilla as options. Hard to believe the Phils would take on another Jamie Moyer-like pitcher in Glavine, or deal for a pitcher, Padilla, they dealt away for very little a few years ago.
Realistically, none of these pitchers is likely to pitch better than Antonio Bastardo, who was dominant at Double-A Reading.