I'd not draft Parekh, but yeah, I'd probably draft the 3 others before thinking about drafting Iginla. I especially like Dickinson and I think he'd be by far our best D prospect if we picked him. He'd make Guhle expendable in the long term, even.
Management seems to like Iginla a lot however, it is rumored they met with him 4 times.
I'd say if you feel the BPA is clearly a LHD, pick him and figure things out later. Beside Celebrini, none of the forwards available would have top 6 impact for at least 3 years anyways, so I'd try to trade for a top 6 forward (Zegras, Necas, etc) at the draft.
Those 2 would play right away in the top 6 and adress one of the team main weakness.
Let's say you trade Guhle for a Zegras/Necas, you then go in next season with a possible top 9 of Matheson, Savard, Hutson, Reinbacher, Xhekaj, Kovacevic
Barron, Mailloux, Harris... You can do something with that. Team survived while Guhle was injured.
And you have Dickinson in the CHL getting ready for prime time in 2-3 years.