Jones, before the coronavirus shutdown, had declared Brown as critical to their survival hopes in the Championship.
Jones said, "I'd like to think we've made him robust now, as I had a conversation with him a month ago and said, 'come on, you need to knuckle down here.'
“Izzy's one of these free spirits that turns up because of his talent and can just play, but he's really, really worked hard in the gym and in his rehab to become robust and to stay fit.
“You need to have a good measurement of his physical output daily, not just in games."
He also told Luton Today: “I got slaughtered for saying we need to keep Izzy Brown fit to stay in the Championship and now two months on, it was proved right, because we are a different dimension as a team when he's in it.
“That's just a fact, that's not me saying it, that's a fact.
"We're talking about the top creator in the Championship, so we're talking about numbers, we're talking about stats, we're talking about facts, and we've missed him, is the truth."
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