I know how monarchy works.
I was just pointing out that the Prince of Hohenzollern has in fact stated that he doesn't have any interest in the Romanian succession and monarchy.
His son, or his brothers, or his cousins may - on the contrary - be as much interested as you want, but still - according to the principles of the monarchical system - in this moment Karl Friedrich is the only one in his family who could nowadays have a claim to the Romanian succession and crown.
If he doesn't do, if he doesn't want to do, then it is quite irrelevant what his son, brothers, nephews or cousins think about the matter.
And, by the way, it is a totally different situation than i.e. the Prince of Wales not being interested in the British throne. In Romania there isn't a monarchy; just there are groups who are advocating the "restoration", which most likely wouldn't be a proper "restoration" of the monarchy as it was before it was abolished in 1947, but rather it would be the "creation", the establishment of a new monarchy, whose rules would be settled now. If the legitimate claimant isn't interested in pursuing such goal, then the whole process comes to an end, since he can't be bypassed by a son, brother or anyone else more interested in it: such way of acting would imply a betrayal of all the principles ruling the succession in monarchies, wouldn't it?