Wawrinka is better than Jo so it's no surprise. Jo could win a set thanks to the public but he'll have to stay focused because mentally he's shown he could be fragile for one or two sets. Also, when Tsonga starts to get angry at the tiniest thing (his shirt, the court, the balls, his racket, his shoes or whatever) that's when he's losing it.
And I really don't think Nole or Murray will have a field day with him. To me, they'll be favories but it'll be like 55/45 for Djoko and 51/49 for Murray because Stan is the most powerful of the last 4 standing.