I noticed a question about EIGRP successor. Please see the picture below. Router 1 is source and Router 2 is destination. Let us define the length of cable represents value of metric. Apparently, R1 to R2 is successor, and R3 is feasible successor. R5 cannot be feasible successor. Based on the concept of feasible successor, R4 should be feasible successor because R4-R2 is shorter than R1-R2. But R1-R4-R2 is longer than R1-R5-R2. Do you still think R4 could be feasible successor ? Thank you.