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Depending on where you live, Gaillardia dies back to the ground during winter. Cutting it down when is dormant is a matter of personal esthetics. Some like the look of new snow catching on the stems and old flowers. Gaillardia is a short-lived perennial so it is a good idea to let it go to seed at the end of the season. It is fine to cut it down if it is no longer green.

Blanket flower loves hot weather and is late to emerge. You may go another month before it starts to poke out. It is also known as having a short life, 3 years or so. Letting it go to seed in early fall ensures survival.

Annual blanket flowers vary in blooming time, depending on the variety. Blooms may appear anytime from early summer too early fall.
Perennial blanket flowers generally bloom from early summer too early fall, but may be delayed if seeds are planted in the garden in the spring.
Perennial blanket flowers early will typically produce a few blooms the first year and will bloom more the flowering year. The advantage of planting perennial blanket flowers is that they will return each year and produce abundant blooms.
https://www.gardeningknowhow.com/ornamental/flowers/blanket-flower/growing-blanket-flowers.htm

That is, simply, explaining that those two cultivars share the same lineage, and will be considered in that group. Both have Gaillardia aristata as a parent plant. Meaning one or both of the cultivar's parentage is of this species.

Early plant growth will require 18- 24 hours of light. Many growers supply a 24 hour light cycle and many growers have great success with an 18 hour cycle. The optimal light cycle period is up for debate. My personal thoughts are that all living organisms need a time of rest. So I offer my seedlings a six hour period of darkness when the second set of leaves show after the true leaves.

Here are a couple of articles that can help:

https://www.gardeningknowhow.com/garden-how-to/propagation/seeds/do-seedling-plants-need-dark.htm

https://www.gardeningknowhow.com/garden-how-to/propagation/seeds/leggy-seedling.htm

Yes your plants are doing well! You can divide Gaillardia in fall or spring, but since they are short-lived perennials, I would plant it now rather than wait till spring. It might not survive the winter in a pot.

https://www.gardeningknowhow.com/ornamental/flowers/blanket-flower/blanket-flower-winter-care.htm