I can't be sure that he will lose to Justin, but if this happens it will be not only due to lack of skills but due to the depression in which he is. The most effective route for Justin is a powerful, well-timed headbutt to Khabib's chin.
I really think this fight will be dedicated to his father that is why I am pretty sure he will still be in his good condition when fighting Justin pretty much he is still focused on doing things if you would look at all the training they are doing and the dedication to all that you can surely see that Khabib is focus about the fight, Although Justin Gaethje's is also ready in this fight and seeing how dedicated he is in taking his style to beat Nurmagomedov I am positive that Khabib will win this.
It is true after coming in the UFC his strategy revolves around a cage but before that he was fighting in open rings without a cage and he was taking opponents down in the middle. All the opponents he faced knows what is game plan is and none was able to stop that and if Justin Gaethje is able to do that it will be a first and so is the reason everyone is excited to see that fight.
This is why this fight is really exciting many would want to see if Justin Gaethje can really stick to his plan that could stop Khabib in his tracks, people are excited if Khabib Nurmagomedov will lose,