What ever Uli signed, he should live up to every letter of the contract. If there were no provisions for the value of the shares at the time he received them, then too bad, it's business and that's that.
Of course, I think everyone can sympathise with someone if they were told there shares would be worth a lot, and then when they received them they were worth pennys, not dollars. Especially if the ones telling you that were also the ones responsible for maintaining your share value.
Seems there are always two sides to the story, but I'm on the company's side here if the contract has been followed as written.
Sure would like to see that contract.....
Maybe it will pop up at a website near you soon.