Lehky is a complimentary player, but a damn good one. He can play with skilled guys, do a lot of dirty work, and leech off some points to where he makes you think there is legit scoring ability there. But he's not a guy who can drive a line and ideally, he should always be the third best player on the line. If he's that, he's amazing. If he's expected to be a guy driving the offense as the best or 2nd best player on the line, he's going to struggle.
Teams very rarely have 6 legit top 6 guys and I'd argue Lehky is on that fringe. Just that Lehky is excellent at being the third wheel.
Here's an example of what I mean. Lehky has 8 points on the season, and 4 5v5. 6 of those points in total are with MacK and Rants. 2 of the 5v5 points are with MacK and Rants. Last season Lehky had 51 points and 20 on the PP. 18 of his 20 PP points were with both MacK and Rants (all 20 were with Rants). 10 of his ES points were with both MacK and Rants. 28 of his 51 points were with both of them. Mack specifically... Lehky averaged 2.7 points per 60 with and 1.7 without.
1.7 is still a solid number... but we're talking more 35 point guy than a 50-55 point guy.
When we're talking about him and Nuke... they are really the same types of players. Nuke is just a larger version and at his best he's more impactful and able to drive the play more. At his worse though, he's worse than Lehky. I'd probably choose Lehky over Nuke because of the term and lesser cap hit, but I'd get an argument to the other side too.