The confirmation that Eben Etzebeth has successfully completed his concussion protocols and will play against Toulouse on Saturday is a nice booster for the Sharks as they prepare for a Champions Cup encounter billed as the Clash of the Champions.The Sharks are the holders of the Challenge Cup and Toulouse are defending the Champions Cup after winning it for the fourth time last season.Those who scoff at the gulf in class between the two European knockout competitions need only look at the lineup that the Sharks will field to know that they belong in the top tier — there will be at least…