I don't see the problem. It happens regularly both in clubs and in NTs that some players want to use different shoes than those of the official sponsor and the common agreement is that they do it but have to put tape over the brand sign of the shoe. No need to handle it any different for Zaytsev.
Nice idea, I've never heard of it. I don't think someone ever did that in Italy.
In that way if it's true it's just a medical problem he should accept, or admit that wasn't the only problem...
Isn't the sponsor errea? I mean the jerseys, kneepads ... are from errea. Before that it was asics but never mizuno or?
Until last year Italy had Asics as technical sponsor, both for the clothes and the shoes. Now they switch to errea, but since they don't make shoes, they had to find an agreement also with Mizuno for the shoes only.