the whole reason brad is not riding is because of poor DS management. Sure there is no denying that froome can win the tour without brad there but its hedging your bets and having the best riders there to achieve the results. A good manager can make a team work well even when there are people who don't get along.
if I was the manager of sky in this current situation I would go to brad offer him a deal. The deal would be along the lines of if you get froome safely through the cobbled stages And give 100% in the mountains as either the last or second last rider in the train, we will in return support you with a return to the track for the 2016 Olympics (as he has stated is a goal). also can offer him alittle bit of extra money if you had too. If he accepts the deal, you organise a press conference with both brad and froome. get brad to make a speech about how he is going to support froome 100%. Finishing it by saying something along the lines of I look forward to repaying froome for all the work he did for me. then both of them get up and hug before leaving.
This will achieve in my opinion achieve a few things:
1. the PR of having wiggans at the tour. The tour kicks off in England. a picture of sky is more likely going to make papers if wiggans is there. otherwise it will be just a shot of the peloton riding next to huge crowds or cav winning.
2. froome has extra protection on the cobbles. or riders that could help cause damage if needed.
3.a stronger rider in the mountains.
4. If froome crashes or gets sick sky wont have to rely on porte who hasn't shown the most outstanding form this year.
5. if wiggans does break his contract/word about working for froome he will 1. lose all credibility with not only any fans but riders in the peloton. none of the bigger teams will wont him unless filling a hole in a team but will only every be seen as a part time solution(OGE) and they wont throw money at him. 2. support for a return the track might be difficult without the support of british cycling body and he would of ****ed a lot of them.
4. great pr for SKY
6. they will keep brad at sky for next couple of years. again marketing value is huge