Albies is 21, Madrigal is 21, one is hitting with power in the majors, starting when he was 20.
The other, who knows?
You can't say this small guy at 18 became a power hitter at 20, so this small college guy at 21 will become a power hitter at 23.
Madrigal might, but Moniak might fill out and develop power.
Yes, he has a high floor, like I said, Hernandez, a fast 2B who gets on base, Madrigal will probably hit for a higher average (though .294 the last two years ain't bad) but a lower BB%, so about the same OBP. Cesar has put up ,099 and .127 ISO the previous two years, can you expect better from Madrigal? Cesar .764 and .794 ISO. Can you expect better without significant power? Hernandez had a 3.9 WAR (prorated for 2017) both seasons. That's a solid ML starter.
Is Madrigal worth a 1st rd pick? Yes. #3?