The crosswind limits are for steady wind not gusts. Its impossible to know the actual crosswind at point of landing in a 737 NG. You use the tower reported wind. Today the wind was gusting and I would be very surprised if the reported wind was outside the operations manual limitations. It will be interesting to see the final report but I seem to remember that you were supposed to cancel reverse if you were having directional problems on rollout. This is not intuitive on a short wet runway.