Maybe it's just me, but I don't think the campaign manager would have made the difference between what we saw happen and becoming President in 2016.
Ron Paul was the only anti-establishment candidate in 2008 in the GOP field. The Dems had Gravel and Kucinich, but they were eliminated early on. So RP ended up with nearly 100% of the anti-establishment vote that year. Ron Paul was also the only anti-establishment, running in 2012, in both political parties. He also received 90% of the anti-establishment vote that year, with maybe Gingrich taking a small share. Other people caught on to how effective this worked, took note, and implemented this in their plans for 2016.
In 2016, the anti-establishment vote was greatly diluted, with 3-4 candidates aggressively going for that audience. We know this now by seeing how much of the RP support in the counties he won have now gone to both Trump and Cruz. It's debatable whether these people truly are anti-establishment or not, but that's a debate left for another thread.
I think if Rand runs the same campaign in 2012, he does far far better than 5% in Iowa and being forced to drop out.