Kubrat is comming to Germany just few days before every fight (max a week time). Before that he is training under his old coach Mikhail Takov (who was coaching Tontcho Tontchev during times when he won European superfeatherweight title in 2001. Also he coached Kindelaki and some other fighters with Panix promotions/Fondu contracts).
I am not so sure if it will be a good idea to come to Wegner, who may want to change his style. Pulev is absolutly complete fighter with more then 250 high level amateur fights from light-heavyweights to Super Heavyweiths since 1999. Now he is very fresh in such 6 rounders, but it may be different when it comes to 8 or 10 rounders against opponents from Gbenga calubur. It may be needed more then just a month to prepare the tactics and condition.
About Helenius, i remember him, when he was amateur and was comming to Bulgaria to fight Strandja cup tournament. During this times he was coached by his father. Maybe it's the same now and just Wegner comming in the ring