Can you crack the logic with which the letters in the attached figure are connected and find the missing letter in the last circle?

T

If you notice closely, the letters around the center are advancing in accordance with the numerical value of the letter in the center.

In the first picture, the numerical value of A is 1 - F, G, H and I are advancing once.

In the second, numerical value of D is 4 - G, K, O and S are advancing by 4.

Now, F numerical value is 6 and so the letters should advance by 6, which means that the missing alphabet is T.