Len obviously isn't a player you'd chuck into a trade all willy nilly, and I actually agree that I wouldn't trade him straight up for Brook Lopez, but its mostly because I have a very low opinion of Brook Lopez (Lopez is crazy overpaid and crazy overrated). However, there is no way he is untouchable or only available for a true star. I think Len is on his way to being a solid backup or mediocre starting center. There is real value in a player like that, not value enough to land an all-star straight up, but I think the Suns would absolutely be willing move him as part of a larger deal.