Most notably, Del Arko is an outcross stallion approved for Holsteiner breeding from a sire line tracing back to the highly successful TB foundation stallion Ladykiller through Tsunami de Hus, L’Arc de Triomphe, Landor S, Landadel, and Landgraf I. Currently the most successful L’Arc de Triomphe offspring is Rokfeller de Pleville Bois Margot. Under Spain’s Eduardo Alvarez Aznar he competed at the Gothenburg Europeans in 2017.
Tsunami de Hus’ dam Utima is a full sister to Arko III, a stallion successfully shown by Nick Skelton. Tsunami de Hus won the 5-year-old class at the Selle Francais Stallion Masters in 2012 and was sold to his current owner Alexander Onischenko at 6-year-old.