Munchkin has stated in interviews that IGLing on GENG is very easy since solo and the coaching staff do so much good prep work.
Not to discredit lakia, but moreso give solo credit for creating another strong IGL through his methods.
If you remember T1 munchkin (the first time he was there) his calling wasn't exactly incredible, it was acceptably good, but on GENG it improved to another level. Now he has done it again with lakia. The solo effect.