It depends a lot on what pick. A "top ten" pick is not specific enough. The difference in value between pick #1 and #10 can be pretty huge, as draft pick value shrinks exponentially between picks.
Mantha is a fantastic player, but he's yet to have a healthy, full season, and is already 25 years old, and will be 26 when 2020-21 starts. Using point shares as a crude evaluation, he still has about the same projected value left in his career as your average 10th best player taken in any given draft. However, that is accounting for only the remainder of Mantha's career (~10-14 seasons) against that pick's entire career. Of course Mantha is ~8 years older and further into his career, but will be better on a per season basis than your average 10th best player available in a draft.
The other factor to consider is the risk. A 10th overall pick is no guarantee, but that could go either way. It could exceed expectations, but just as easily could bust. Look back on the 10th overall picks of the 2000s - Dylan McIlrath, Magnus Paajarvi, Cody Hodgson, Keaton Ellerby, Michael Frolik, Boris Valabik, Andrei Kostitsyn, Eric Nystrom, Dan Blackburn, Mikhail Yakubov...every single 10th overall pick between 2000-2010 was a bust. At the same time, it is a bit risky for the team trading the pick. You might hit a Jonas Brodin or Mikko Rantanen. Meanwhile with Mantha, you know you have an elite scoring winger already, there isn't a huge risk that he's going to suddenly drop off a cliff at age 25.
Here's a chart comparing Anthony Mantha's projected remaining value (
assuming he remains relatively healthy, and retires after his age 38 season, when his point shares drops below 1.0) to the career value of your average best player available (
assuming the same career length as Mantha), second best player, etc, in any given draft year. The values are in point shares, just a rough value metric from Hockey-Reference.
Player | Proj. Value Remaining | Proj. Seasons Remaining | PS/Season |
Best in DY | ~166.23 | 18 | ~9.23 |
2nd in DY | ~138.70 | 18 | ~7.71 |
3rd in DY | ~122.73 | 18 | ~6.82 |
4th in DY | ~109.93 | 18 | ~6.11 |
5th in DY | ~100.53 | 18 | ~5.58 |
6th in DY | ~93.29 | 18 | ~5.18 |
7th in DY | ~86.83 | 18 | ~4.81 |
8th in DY | ~80.56 | 18 | ~4.48 |
9th in DY | ~74.64 | 18 | ~4.15 |
10th in DY | ~70.79 | 18 | ~3.93 |
Anthony Mantha | ~70.90 | 13 | ~5.45 |
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So, in an average draft, the 6th to 10th best players will be worse than Mantha will be for the remainder of his career, but given that they are ~8 years younger, they will provide more value over the long haul of their careers. The 1st to 5th best players in any draft will be better than Mantha, and also play longer, so trading a top five pick for Mantha seems somewhat ludicrous.