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Whether or not grass will fill in bare spots itself depends on the type of grass you have. For example, grass with rhizomes (e.g., Bermuda grass) and stolons (e.g., Saint Augustine grass) will naturally fill in bald spots as it spreads laterally. However, clump-forming grasses will not spread. 

Technically, yes, at least some of the grass seed you throw on the ground will germinate. If the area doesn’t have good drainage, rain or overwatering can move seeds before they have germinated, leaving your patches still patchy. What does grow won’t have strong roots if there isn’t proper aeration.

Power seeding and aeration are both excellent ways to improve lawn health, but they serve different functions. Aeration focuses on improving soil health by creating channels that allow more water, oxygen, and carbon dioxide to reach the roots. In contrast, power seeding is a method of planting grass seeds, often by creating narrow trenches in the soil. One service isn't better than the other; they are complementary. It is beneficial to aerate your lawn before power seeding, as this makes the seeding more effective by helping the germinating seeds access the resources they need. It's a good practice to aerate your lawn once or twice a year, regardless of whether you plan to power seed.

Yes, Bahia grass spreads on its own thanks to its short stolon system. However, it might not seem like your Bahia grass spreads well due to its slow growth. Bahia grass takes around 3 to 4 weeks to germinate and an additional two weeks to grow thicker. 

During this time, fast-growing, competitive weeds may pop up, so weed your lawn to give your Bahia grass a chance to grow. This grass can take up to two years to become established. Once established, Bahia grass typically does well in suitable climates.