Good Tagers shouldn't be sledging against you because they will get 3C'ed everytime they do. Tager's combos are longer than 3 hits so I dunno what you're talking about and I don't see the relevance. What you can do with the elbow drop is: 1- 2C it. 2- 214D~B it. 3- Block or Instant Block it and punish.
As for GF mixup this is how it works. It definitely is a gamble and can pay off for Tager if he makes good reads but it's still favorable for Hazama.
Here's how GF works:
btw I'm not mentioning command grab in any of these situations except when the Tager blocks. Go figure that out yourself. Although it does beat quite a few of his options, it's generally not safe to try to command grab Tager after GF.