I too am a big fan of vibrams, especially for running on grass/beach. But, with the exception of performing triple extension movements (acceleration sprinting, clean pulls, etc.) in a pair of cushion heeled sneakers vs. vibrams, I don't think any real changes in calf size would occur. You may get some increased strength in the peroneal and post tib muscles...but these are small muscles that aren't subject to a high potential for hypertrophy. Same with the soleus, which is why seated calf raises are a silly exercise.
Ill be wearing them throughout the entire session of every workout. So just the fact that im ambulating in them around the gym for 90 minutes 5 days a week while performing lifts, whether its deads, calf raises, bench, or curls, will hopefully impart some noticible result. As far as anterior tib and peroneus, i saw Kai Greene doing a machine specifically designed for weighted dorsiflexion lol I think thats pretty ridiculous.
Br