Explaining how he gets ripped to about 4-5% fat and you dont find a single cut in them. You dont just NOT have cuts in your shoulders. ( explanation only applies if your serious )
I think that Markus has an unusual genetics, and his shoulder muscles receptors are phenomenaly active. My opinion his that his muscles can store lots of water. If you pay attentio to the vid "Ruhl Made in Germany", when he is training his shoulders we can se striations but when he is only flexing they are not that visible. Adding to this I think that he is more into testosterno than into GH, all is muscles are "swelled", but he is a strong BBer. Oily bbers are not that strong or heavy.