It remains possible that the GBPUSD has made a significant high. Remember, the entire decline from 2.1160 is most likely unfolding as an impulse (5 waves) and just 3 waves have unfolded. The rally from 1.3500, although strong, still counts well as a correction (3 waves). In fact, price reached and reversed at a former 4th wave (common guideline). The rally from 1.5800 was an impulse, making it possible that wave v of C was truncated. Staying below 1.6626 keeps the topping scenario intact. Potential short term resistance is 1.6430/60.