Sagging skin fold under jaw after necklift and lower face lift. T incision revision has been offered. Advice please! (Photo)

It's difficult to say without the benefit of a formal evaluation. This is my expertise and a huge portion of my practice. Asymmetry is normal and expected. See an expert who does facial shaping with surgical and non surgical methods to get a comprehensive option. Best, Dr. Emer.

I am sorry to read of your disappointment. The #healing process can take from 2-6 months for face, neck and cheeks, and to 9-12 months for the forehead and scalp. Also, some degree of firmness or lumpiness under the skin is normal after surgery and will resolve with time. Local #massage of the areas may accelerate the resolution of this problem, which normally takes 2-4 months to disappear completely.Typically, it's best to wait 6 to 12 months depending on the reason for #revision. As with all #cosmetic surgery, results will be rewarding if expectations are realistic. With any surgical #procedure and #revision, there are some risks of unhappy outcome or other complications which your surgeon should discuss with you during your consultation. Also, your procedure should always be performed by a Plastic Surgeon who is board-certified and has a great deal of experience specializing in facial #surgery and #neck lifts. Additionally, you should feel confident and comfortable with the doctor you choose. Whether it is the same doctor who did your original surgery, or, you feel it necessary to seek a new one. 
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I'm not sure what your doctor did with his surgery, or if a platysmaplasty was done.  i would not offer a T incision because of the risk of visible scarring.  I would consider a platysmaplasty with a revision lift, but I don't know if this was already attempted.  Its best of seek another opinion if you are hesitant about your surgeon's advice.

You appear to have redundant skin and platysma that needs to be addressed. Although this can sometimes be improved with a platysmaplasty through an incision under the chin and "redraping" the skin after extensive undermining. A "T incision" would be a last resort and should rarely if ever be done due to visible scarring in the skin of the neck.