Grigson spend a lot of money on average and aging free agents. Ballard obviously isn't spending much in free agency. So far Colts only got bigger holes in their roster and I doubt you can fill them only with draft picks. In my opinion the smartest strategy is a mix of both. Making smart deals in free agency and if you can get a quality player at a position of huge need you can afford to overpay once a year. And the rest get from the draft!
It would be a smart choice and Nelson is easily Top 5 probably Top 3 talent in this draft. I don't care if some people don't value Guards. The Offensive Line is a mess and Colts can't afford to gamble again by hoping that some average veterans turn things around. And yes there is a real chance Colts drafting Nelson! Protecting Luck has to be Priority Nr. 1 and so far Colts failed to improve the Line
If they sign Fluker it's a sign the Colts still don't take the Offensive Line problems serious enough it's the same move Grigson would have made. Sorry, but Fluker isn't good. There is a reason the Giants let him go and having OL issues themself.