Here's the deal: Assuming you are at D3, if a recruit is on your D2 list, that does not necessarily mean that you'll need to pull him down. The way to tell is simple; send a coach call, letter or phone call. Just one should do. The response to that contact always falls into one of the following categories: recruitable, backup, or never. If it's one of the "never" messages, then remove from your list and spend no further effort on him (out of habit I use the red or Low priority setting for this).
If it's "backup", then you can either do nothing and wait for a "dropdown" message or attempt to pulldown with whatever effort the recruit cannot refuse. For pulldown's, it may be so, but I'm not sure that you need to get on his considering list before sending other effort, I only ever pay attention to whether the recruit will accept visits. If he'll accept a visit at all, then he's moved from backup to recruitable.
If he's recruitable, then you still might have a visit rejected, but usually a second effort or a few letters will get them accepting visits.