David Tua would be a bad match for Haye , i think wipe out Skelton / or Williams / he cant just jump up to heavy and expect to be fighting the top guys. After the weight he shed to make the Mormeck fight he has to put it back on with the correct diet and training which will take time.
At the moment Tua would KO Haye in my opinion.
PS. id love to see him blast Skelton out who simply has an awful fighting style, and for me is always in disgraceful condition , flabby and un toned.