Does he have any wrestling or takedown defense? even if he does, he's probably still getting submitted by Yahya.
Ground used to be his weakest area but he took something like 3 years off to better that area. His homepage says:
ADCC
2009: Submission wrestling finnish open 2009 1st place 76,9
2008: Submission wrestling finnish championships 2008 76,9 kg
2007: Submission wrestling finnish open 2007 2nd place 73 kg
2005: Submission wrestling finnish open 2005 1st place 67 kg
FILA
2011: European championships grappling no gi 1st place 2011 70 kg
2011: European championships grappling gi 3rd place 2011 75 kg
2010: European championships grappling no gi 3rd place 2010 70kg
2010: European championships combat grappling 1st 2010 70kg
He also outwrestled Chase Beebe who was a four-time Illinois State Champion for Montini Catholic in Lombard, Illinois. (from Wikipedia)