Hi everyone, I'm new to the forum.
Nice discussion about the substitution rule. However, I notice a real philosophy change on Instant Replay. By changing the use of Replay for targeting, in effect the replay official can now throw a flag for another foul (e.g. unnecessary roughness) when it wasn't targeting. That is new, I belief. I'm curious how this will evolve next years.
Fortunately not something we'll have to deal with over here in Europe
Football Rules Committee slightly adjusts targeting rule, defensive substitutions | NCAA Public Home Page - NCAA.org