...the license for 1290 has been deleted, but the frequency is still allocated to Ocala and therefore available for someone to apply for
1290 is not "allocated" to Ocala...no AM assignment is. If WTMC has been deleted, it's g-o-n-e, gone, and the "space" it occupied can be filled by anyone desiring to do so, and that includes existing stations located somewhere else.
A power increase for WTKS would be a minor change, which can be filed at almost any time desired.
WTKS is non-directional daytime. 5kw was the daytime maximum for stations on 1290 (and other, "regional" channels) for many years, and the Savannah station has operated at that level since the 30's. They probably could increase their daytime power to 10kw, and remain omni. Much above that, and you're looking at some degree of directionalization. A more powerful WTKS would have two stations that would be of initial concern...1290 in Sumter (138 miles) and 1270 in Hampton (55 miles), with Sumter being the critical one. The Hickory station is 254 miles away, but their daytime directional has a general null to east, with a slightly enhanced lobe (above omni) from about 355 degrees (almost true north) around to about 175 degrees (south). From WHKY to WTKS, the bearing is 178 degrees, so any significant power increase for Savannah would need to consider Hickory. To be sure, there would be other stations to consider, but these would primary. WTKS has a 4-tower array that is basically a parallelogram. Trig wasn't my best subject and I don't have the computer program, but there is at least some possibility that the present array might be used for any daytime directionalization required to increase power.
The WTKS nighttime pattern resembles an offset bow-tie...major nulls to the NNW, NNE and S, with a minor lobe to the W and WNW, and a major lobe to the E (for Cap'n Sandy and Davy Jones). In the daytime, the southern null could possibly be relaxed, and the easterly and westerly lobes more balanced, while keeping the NNE lobe, which is directly toward Hickory. I suspect that when WTOC went from 1kw omni at night to 5kw-DA, they had to protect both WTMC's and WHKY's 1kw nighttime coverage, which would explain the nulls in those directions.
This AM stuff is NEVER as simple as it would seem to be, and I'm probably not considering some obvious factor. Still, with an investment in a larger transmitter and the necessary legal/technical/FCC fees and charges, WTKS could probably easily double their daytime power. Nighttime? They've probably got all their gonna get at night without some serious bucks being spent.
Of course, the bottom line is this. WTKS covers the primary market, including Hilton Head. Putting a better signal in Statesboro or Jesup ain't gonna bring in another dime. That said, don't look for any power increase for WTKS.