I`ve heard that Rebecca has played her part in stopping Matze from developing an interest in Dian too - she was jealous. Ruby, on the other hand, had been mated by Matze serveral times if I remember correctly. I hope these two will breed with Viatu while Rebecca already has more then enough sons! Matze could have sired many more infants, but honestly, I am happy that there are "only" the 18, he is already overrepresented in Europe and in my opinion, too many of his sons have a breeding group (Damisi, Akili, Rick, Horst!), with Derrick siring serveral offspring before his death and daugthers Inge, Liesl, Lia and Changa breeding too.
He is very over represented. Every where you look there are Matz offspring and their offspring! I was sorry Damisi was recently chosen for Chessington for that reason.