I don't particularly care for it, either, but I have seen a few of these comparisons that aren't really comparable - apologies if you think I'm picking/digging you out. Not the intention.
I think if you get told what is what, you can probably test that water a bit, but as the interested and persistent party, it's then time to pony up or go about your business instead of loitering like a bad smell whilst the homeowner (
) peers through their window wondering what they've got to do for you to leave them alone.
Further to that, of the two parties, we're the more desperate - less assured of even being a top 4 finishing side this season than Sancho of either maintaining or improving his level. We could very easily be prizing Sancho out of our own hands should we not get him this window, have a calamitous one whilst he goes on to cement himself as one of this generation's sure things. It's not a one-way street here where ceteris paribus means we just continue this merry dance next summer.