#1. The timing is perfect
The simple sign that should be the biggest indicator is the timing of the entire situation. As you probably know by now, timing in wrestling is everything and if superstars get injured in such times, they risk the possibility of losing their push to someone else.
Sometimes it works out better, but that's the reason why many wrestlers push through and compete regularly despite carrying injuries with them. Thankfully, that doesn't appear to be the case with Drew McIntyre right now and it seems that the stars have aligned for him.
Apart from just gaining momentum and Lesnar not having a challenger, the track seems to be cleared for him and barring a hiccup, injury or a returning superstar, there isn't anybody better for that big spot at WrestleMania.
The timing has never been better for Drew McIntyre and had you asked us last year, we would have told you that the timing was right for Seth Rollins. WWE listened and hopefully, the same will be the case this time as well at the Royal Rumble 2020.