There were both.
And again, for the third time, someone just saying strong or just having round eyes without saying anything is not having all of the above + worried face.
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Nope. 'Strong' is just a random way for them talking as Kaido told about Sulong Inu and Neko.
You really think Luffy is worried for himself that Kizaru is 'strong'? If you really think that you should re-read the story from beginning, you clearly missed the things Luffy does, even in Dressrosa he was attacking Fujitora and saying it won't be the same as 2 years before but suddenly after being Emperor, Luffy is worried because Kizaru is 'strong'? Thats a terrible reading comprehension for Pancake Ladmiral wankers as usual.
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Also, Kaido just said Inu and Neko were that strong to beat Jack.
Same thing, Luffy said Kizaru is strong enough to beat his allies Sentomaru and he can pass through the defenses, same way Kaido says Inu and Neko are strong, same way Shanks tells his crew Lucky Roo they can't handle Kid and was worried for his allies.