Point is that Luffy instead of going to NW trained for that time.
Law on the other hand didn't go to the NW, and was completely chill, waited for the right moment to enter Law. You claim that Law trained that time, can you prove that he trained during that time.
Also, last time you dind't adress my point about their talent.
Law needed 7 more years to be on the same level as Luffy, 24 years old Law was around as equal with 17 years old Luffy, why do you think that they grown was same or even that Law had bigger grown than Luffy during time-skip. This is also going by your claim that Law trained before entereing New World.