Namikaze Minato has the attributes of "Thunder" and "chakra", so Zidian and Rachel can learn with their talents. However, Rachel has many restrictions, which are a bit redundant for Namikaze Minato.
Friends of Watergate know very well that Huo Ying's four generations are good at using Raytheon, Seal and Immortal mode to fight, and basically dealing with ordinary enemies is Raytheon+spiral pills. Some people will wonder why Watergate basically doesn't use Ninjutsu to carry out long-distance containment attacks in combat, which involves a hit rate problem.
Conventional Ninjutsu skills need to be printed, so it may be blocked when the enemy discovers the printing process in the preparation stage. Secondly, even ninjas with strong ability to launch routine ninja can avoid it. Therefore, the four generations of Huo Ying took advantage of their own speed, so that the enemy had no chance to predict the attack mode in advance, and the unprinted spiral pill made the enemy impossible to prevent.
So, what Namikaze Minato needs is lethality and skills without printing, which Rachel can't satisfy. Although Rachel has a larger variation and coverage than the primary version of the spiral pill, in fact, if people print after close combat, they may delay the fighter plane. Therefore, personally, Rachel is not suitable for Namikaze Minato, even if he learns to play a role in the battle.
Rechet is a routine ninja that needs to be stamped, so it is not suitable for Namikaze Minato's Flying Raytheon to sneak up on the enemy. The advantage of spiral pills is that they don't need to be stamped when they are launched. Can quickly seize the opportunity to solve the enemy.
Kakashi's improved subsequent thunder shield sub-code can be released without printing and has the ability of group attack, so this skill is often suitable for Namikaze Minato.
Although the spiral pill has the advantages of no need to print, its defects are obvious, such as only attacking one enemy at a time and consuming a lot of chakra. However, Kakashi's sub-code move developed after losing Shalingan also needs no printing and has a wide range of attack capabilities. Personally, I think it's very suitable for Namikaze Minato to study, so let Huo Ying choose one more in the battle.
If you are dealing with a small number of enemies, flying Raytheon+spiral pills or flying Raytheon+purple electricity are all good choices. However, in the face of multi-target situation, Namikaze Minato avoided the problem of excessive consumption of chakra by repeatedly using Raytheon, and gave multi-target thunder shield to kill at one time, which was convenient for Namikaze Minato to follow up. Moreover, Raytheon needs special hardship to determine his position. Once the trait bitterness is not used up or lost, purple electricity is a very useful second attack option. Coverage is much larger than spiral pills.
The purple electricity developed by Kakashi can be like a spiral pill without printing nine, and even has the ability to attack multiple enemies on a large scale. It is very suitable for Namikaze Minato, which has the special ability to drive Raytheon. Therefore, after learning the Dictionary, Namikaze Minato's combat effectiveness will be improved to varying degrees.
Finally, to sum up, I personally think Zidian is more suitable for Namikaze Minato than Rachel. On the one hand, the sub-code does not need to be printed, and the attack range is wide. On the other hand, it doesn't need the cooperation of Saringan, so I know that Purple Dot does have a blessing effect on Namikaze Minato's fighting capacity. In contrast, although Rachel has good lethality and many variants, it is not suitable for Namikaze Minato's conventional combat mode. Please forgive me if the analysis is not in place. If you have other ideas, please leave a message to discuss.