A broad saddle is not a fault as such and providing he meets the breed standard in every other way he should be fine. The wider saddle is supposed to derive from the Essex side of the equation when the Wessex Saddleback and Essex amalgamated in 1967. It will have some influence on his offspring but may well be balanced out by a narrow saddle on the gilt. What you will see is that the piglets in a single litter all vary in the amount of white they carry.
Whilst you are really interested in the meat market, having acquired a pedigree boar, can I suggest that you make a little effort, join the BPA and birth notify all the offspring bred from registered parents? This gives you two advantages - firstly, you can sell the best pigs you produce as pedigree breeding stock for which there is a premium and secondly, every time you birth notify a litter, you can download a meat certificate from the BPA website to support your claims when you sell your meat. According to a recent Trading Standards ruling, if the parents aren't pedigree registered, you cannot legally sell the meat as being from a specific breed so the certificate is a good marketing tool.