Cole I would agree with you except they played the option very well vs Texas State last week, this is their second straight week practicing vs. this kind of offense and NMs QB got hurt vs. UT last week. Their offense was never the same.
Tech will be hurt by power and size but I don't think speed to the outside will be their problem this year. They have LBs that can flat out run now.
It's hard to evaluate Techs D this year based on last year. There are new guys and more importantly a totally new defensive staff that has done a great job giving the players confidence.
But, based on Techs history vs good option attacks then I would agree with you. I just think it's a new time for Tech on D. Tommy has finally shuffled the guys around the get as much speed on the field as he can. That means they're a smaller D but very fast.