I might repeat some of the things that others have already pointed out.
First off, unless chromosome counts have been performed, polyploid should not be a guess work based on the appearance. Call it 3N or 4N only if it is. If not confirmed, then, they should never be called as such.
Now, the wavy edge is typical of malipoense and has nothing to do with 4N. Also, the degree to which the leaf margin is wavy is highly variable among the individual plants. The species in general run on the large side. So, none of the things that have been said regarding your larger plant is out of ordinary for malipoense. Some are smaller and others are larger.
The plant in spike in your very first photo looks very much like typical malipoense to me.
Also, your two smaller plants are smaller than the average for the species.