I think that in some instances Jay is biting but there are other times when I wouldn't consider what he does as biting.
Like, for example, in 'The Ruler's Back' (obviously a rip-off/remake of Slick Rick's song) Jay spits the lines,
'Well in these times, well at least to me
There's a lotta rappers out there tryna sound like Jay-Z'
Slick Rick had spit an almost identical line with 'Ricky D' in place of 'Jay-Z'.
While some may consider this biting, I don't. Any rap fan knows that there are several lines throughout that song that are those of/close to those of, Slick Rick's original & while I wouldn't necessarily consider this a homage to Slick Rick, I would say that it's so blatant that I doubt even Slick Rick considers this biting.
& for those that would consider this biting, is Snoop's remake of 'La Di Da Di' biting?
What about 2Pac's line in 'Got My Mind Made Up'?