A Fox Creek Lanceolate will look like that in its' resharpened form, and it does look resharpened. BTW, a Jack's Reef Pentagonal has been interpreted as a stage in the creation of a Jack's Reef Corner Notch. Not in every instance, but in general they only need to be notched to create the corner notched form. Steve's example from Ohio is one of the typical forms for Jack's Reef Pentagonal.
Here's a resharpened Fox Creek Lanceolate, in this case resharpened to exhaustion. Material(quartzite) eliminated JR Pentagonal in this case. The preferred material here was jasper from Pa or RI, and hornfels, a metavolcanic that flakes well. Never quartzite.
In the Northeastern states, the Jack's Reef points are usually interpreted as the first true arrowheads, meaning small enough for use with bow and arrow technology. It's a truism, meaning it won't always be the case, but very often is, that large points were usually used as knives rather then projectiles. Just a rule of thumb for some, and usage wear can confirm or dispute it.