Crwonshep and Hazbin,
Arnold has site-injection scar tissue in his soleus muscle underlying the gastrocs (which are somewhat developed). Because the gastroc is stretched over the scar tissue the fibers are spread crating the striations (and the tell tale lumps in the inner gastroc, which should be flat).
Bodybuilders with genuinely well developed (100% muscle) calves have no such spread striation when they hook their foot. See: Mike Matarazzo; Erik Frankhauser; Dorian Yates.
Nasser el Sonbaty; Aaron Baker and Arnold do.
They aren't implants, to argue such is ridiculous... it's a mixture of real muscle and underlying site-injection scar tissue... simple and obvious.
No one can have huge gastrocs with thin shitty solea... it's just not possible genetically.
The Luke