Tevez wasn't a guarantee when we signed him? Apart from his off field antics, he was being brought here as a sure shot performer, mind you. Tevez and Pirlo were near certain guarantees as players, and they're the ones outgoing this summer, which means that level of quality needs replacing. Add Vidal to that bunch and you'll find the starting eleven, save for Pirlo's gradual decline, has lost two star performers. What you're also mistaking going back to the Vidal signing, was where Juve were at that point in time. Two back to back 7th places. Trying to find their way back in Italy, and qualify for the CL. That story has added a few pages to the book. This includes four back to back scudetto, a CL QF, a Europa SF and a CL finalist position to boot, with a far greater turnover than we had in the year we signed Vidal for the money we did.
Our objective now is keeping pace with where we are, and to do that, in a season of high attrition, you would be well served to sign a player who comes with better experience to adapt at a big club, since he comes from an equally big club. A Goetze for instance, offers that over a Draxler. He works in an environment where the pressure is high on a daily basis, he's a World Cup champion and he knows big game temperament, that is the kind of combination you need to be served with when you have lost the kind of starters that we have.
To conclude, I would disagree that Draxler would top off a 'helluva mercato' given that Vidal has been sold for under 40m.