I liked the episode, I was a bit taken aback by Kongwe's advice as my initial reaction was,
SimbasGuard wrote: You got nothing.
However you could say that she told them to be prepared, she just neglected to say what they should prepare for. That being the case from a military perspective if you take Kongwe's advice you should try to cover all your bases in the meantime. Which in a war you should do anyway. I guess Kongwe's advice just reminds them to not be to hasty in their defense perorations, so as not to miss anything.
Also Simba and Kion were displeased with Kongwe's advice until Fuli explained what she was saying.
As for why Simba could not go to meet Kongwe: After the assassination attempt (that nearly worked) Simba going out on his own would have been a bad Idea. He would have either needed all of The Lion Guard or a large contingent of Lionesses with him. (and let's face it Adult Lionesses of Simba's Pride are extremely had to find on this show).
As for Simba talking with Mufasa: I think Simba was only able to do this because Kion was with him. I still think Kion's ability to communicate with Mufasa is a power granted to him by The Roar.
Given what Mufasa had to say about Scar, my theory about Mufasa being the one to defeat Scar was shot down.
As for Fuli's Song: I love it when Fuli sings. I wish she would get more songs, I did not like this as well as I have her other songs, but it was still very good.
I think the reason that previous footage of Fuli was used was because she was singing to Kongwe so having her actually run around during that scene just would not wave worked.
As for Fuli's Fight with Makucha: While I did not give this much thought at the time. I get the feeling that he was not afraid of Fuli, he was toying with her trying to see what she can really do and perhaps assess what kind of threat she may become. Perhaps he was careful of how he dealt with Fuli so as not to give The Lion Guard a reason to come after him. The Reason Fuli was able to tackle him was because she worked up speed before lunging at him (she used this move against Vitani and Janja as well).
As for Makini. I am pleased to see that she tried to use some martial arts. Being that The Pride Lands are now at war, I think Rafiki should give Makini more combat training. Preferably unarmed combat considering how she
always breaks or looses her staff.
As for showing what the rest of The Lion Guard was doing while Fuli was on her mission. This was needed(as was mentioned by SwagaliciousXXX) as a juxtaposition to what Fuli was doing so as to better further the moral of the story. (something I did not consider), besides sticking with Fuli, Makini, and Kongwe through the whole episode would have gotten old fast. Although I admit seeing Kion tell Simba about Scar being back would have made for an interesting scene. I thought it was O.K. to showcase Beshte's strength in a way we have not yet seen. There is also the possibility that we could very well see another Big B Bridge at some point in the future. Although I am surprised that Kion didn't tell The Elands to cross one at a time.