The tree looks great.
Lower branches are shed by trees naturally because the tree knows it will have to compete with other plants for light, and the best light will usually be up high.
If the tree grows, and there is no competition for light down low, the upper branches will cascade down to ground level.
Since the tree has new buds, it means the tree is alive and growing. It will spend a lot of its energy reserves building new roots, so you may see slow growth the first couple years, then it will take off.
Continue to keep the grass away (grass is highly competitive for water and nutrients) and water during drought. You may want to add compost to the surface. It is excellent soil conditioner and slow release fertilizer. Garden centers sell composted sheep manure for a couple bucks a bag, which is a good choice because sheep manure is slightly acidic, just what acid loving trees like in our high pH soils here in SE WI.
Do you think the deer will find them?