It doesn't seem like a good idea to sign Pache to that sort of deal at this time. The biggest question surrounding him at this time is will he hit enough. Giving guaranteed money to a guy with a decent chance of being no better than Harrison Bader doesn't seem like a smart move.
Also, that's a terrible deal for Arenado even considering they would kick in 70 million. That's roughly 90 million in surplus value we are giving up.