Quote ="Dux"Lyon was a good tackler but used to come out of the line unnecessarily on occasion. Gidley is the more positionally savvy defender of the two.'"
perhaps.
However Lyon completed a greater percentage of his attempted tackles, was pretty good at fielding kicks (high, low or behind him). Id say he's at least as good as Gidley defensively even if Gidley had the upper hand in positioning.