8 weeks post. Need second surgery due to failure of tension closure of hernia. Can tummy tuck be improved at that time? (Photo)

your lower abdominal skin can be tightened further along with lowering the scar.  It is too early to have that done and I advise holding off for six months.  Ideally it would be converted to a full tummy tuck, however if the umbilicus was floated this would not be possible.

Your excess skin on the abdominal wall- is vertical- that means the excess is from upper abdomen to lower abdomen. Therefore, only a horizontal incision will fully address this excess skin . If you have a fully performed abdominoplasty  through a low horizontal incision accompanied by rectus muscle repair-you should get your best result.