It doesn't seem like law is going anywhere anytime soon. If anything things seem to be heading towards him getting even closer to the strawhats once their crews meet at zou. Right now law's enterprise with the strawhats is at the most halfway done. They did not join to take down doflamingo, they joined to take down kaido.As much as I'd like Law to stick around and fight another shichibukai with the Mugiwaras, I don't see it happening nor do I want it to happen. Law is great but he isn't with the crew, just an ally, he should go his seperate way soon. This seventh shichibukai better be a shocker. That's all I'd say.
As for Lucci, it is pretty obvious that he's become even more badass than before. I mean Spandam who had a hella ego before is now Lucci's bitch. If he wasn't an awakened Zoan before he might be one now. And in these past two years he must have at least learned some haki. How can you be in the feared strongest cipher pol group without knowing how to utilize haki? Spandam might be the only one who lacks it, using his mouth to get to where he is at now.
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Lucci is certainly strong right now and should be considered a thread though to what extent he grew is anyone's guess. Though to be fair the strawhats overall seem to be at a slightly higher level than their equivalent peers in general. Take smoker for instance. He certainly has lagged behind law or luffy. Luffy himself seems to be a bit above law when it comes to overall power. Zoro has basically breezed through the new world so far. Hyosu was the strongest enemy at FI and he won easily, there was no one who had a chance against him at punk hazard and even against pika he won with a reasonable margin even without using kyotoryu. Sanji was able to hold his ground against vergo even after he had taken a fair bit of damage and even doflamingo commented on his strength.
Anyways, if lucci has had growth comparable to the non strawhat growths we have seen so far then he should lag a bit currently compared to luffy and even zoro. He would make more sense as an enemy for sanji than the other two IMO. Then again it's unlikely lucci will take a big role in the future, I don't think that would make much sense.