On balance, the coarse Indias and Crystolons are about as good as any super-coarse waterstone. Coarse waterstones are almost always very soft and dish quickly. That means flattening several times in the course of a difficult knife or a major repair. The "oilstones" relative lack of maintenance requirements, balances their lack of speed and their coarse scratches.
Something I've said before bears repeating for those getting into sharpening. While I use medium and fine oilstones, and am all too delighted to discuss them, I don't recommend them anymore for people putting together their first sharpening kit, or thier first quality sharpening kit. Waterstones are that much better. Naniwa Superstones in particular, because of their excellent feedback, minimal soaking requirements, relatively simple maintenance and relatively reasonable pricing, are ideal for "honing" your skills. If I were putting together a waterstone kit for myself, I wouldn't choose any of them (with the possible exception of the 10000#). But if you're just starting or making the first step up, they'll serve you better than anything else for a couple of years.
When repairing the broken tip of an important knife I try to work from both top and bottom, attempting to retain the tip to midline relationship of the design. If it's a knife that takes a lot of abuse, especially a small knife, I work towards useful geometry. So, I'll work from the top to create a sheep's foot on a parer that's going to be doing garde manger, decorative tip work, or from the bottom to repair a European style boning knife.
BDL