The ridge is there, you are reading that correctly -- the outflow from the trailing band of Cindy is feeding into the ridge, as evidenced by the anticyclonic turning. However, the appearance of the wedge is because part of the northern extent of the ridge has been eroded by the storm, assisting in the NE movement of the storm in its own right. It's partially cause, partially effect, but the latter should win out to some degree over time. It'll be an indirect impact upon Dennis & its track, but large enough to be felt I believe.