It's not a dump on him... Necas is a Jekyll and Hyde type player in that he is absolutely excellent about creating offense and he goes about it in a very specific Martin Necas way but he is the furthest thing from a complete hockey player. It's not that he's bad at other parts of the game exactly (defense, physicality) they just literally do not register in his brain. Like all he thinks about it getting the puck and skating with it into the offensive zone.
Canes biggest issue in the playoffs has been goal scoring in later rounds. Aho is just about the only one of the big guns who has produced consistently there. Necas up until last year had very underwhelming runs because his brand of hockey and the playoffs and how the Canes play did not mix. Maybe on a more run and run team like the Avs that will work out better but there is a reason why Necas + / - ends up where it does when the team overall has very good goal differentials each year.
Necas was a + 4 while having more points combined than his most common linemates Kotkaniemi and Robinson while each of them has a +/- of +10 and +13. It's been 6 years now but please do not misunderstand. Canes fans love Necas and know what he is capable and ideally never wanted to let him go but it was only for the right big fish player they would do it. He is probably the most offensively gifted player that the Hurricanes org has probably ever had. He just plays his own way... and he's really good at it but there are gaps there as well that may never go away.
Rants is a better fit for us and hopefully we can retain him. He and Svech on a line together is scary and if they have offensive chemistry like they showed last night it will be huge in unlocking Andrei's potential as he is a player who can contribute more but hasn't found a running mate with consistency in Carolina. Aho can and will play and produce with anyone. I'm sure we will get some Finn on Finn action there but having two dynamic scoring lines and then allowing the 3rd and 4th lines to focus on what they do will be huge for us.