Here are the Guards (Point, Shooting, and Combo) that have been drafted in the 1st round (non-Lottery picks) of the NBA draft the last 3 years:
2016
29th [CG] D. Murray (6'5") - 16 ppg / 6 rpg / 4 apg
22nd [SG] M. Richardson (6'6") - 13ppg / 4rpg / 2 apg
20th [SG] C. LeVert (6'7") - 17 ppg / 5 rpg / 5 apg
19th [SG] M. Beasley (6'5") - 16 ppg / 5 rpg / 2 apg
17th [PG] W. Baldwin (6'4") - 14 ppg / 4 rpg / 5 apg
2015
28th [SG] RJ Hunter (6'5") - 20 ppg / 5 rpg / 4 apg
24th [PG] T. Jones (6'2") - 12 ppg / 4 rpg / 6 apg
20th [PG] D. Wright (6'5") - 15 ppg / 5 rpg / 5 apg
19th [PG] J. Grant (6'4") - 17 ppg / 3 rpg / 7 apg
17th [SG] R. Vaughn (6'6") - 18 ppg / 5 rpg / 2 apg
16th [PG] T. Rozier (6'2") - 17 ppg / 6 rpg / 3 apg
2014
28th [SG] CJ Wilcox (6'5") - 18ppg / 4 rpg / 3 apg
27th [SG] B. Bogdanović (6'6") - Foreign Player, No College Stats
26th [SG] PJ Hairston (6'6") - 15 ppg / 4 rpg / 1 apg
24th [PG] S. Napier (6'1") - 18 ppg / 6 rpg / 5 apg
22nd [SG] J. Adams (6'5") - 17 ppg / 5 rpg / 2apg
19th [SG] G. Harris (6'4") - 17 ppg / 4 rpg / 3 apg
18th [PG] T. Ennis (6'3") - 13 ppg / 3 rpg / 6 apg
Every single one of them either is a true PG, averaged 16+ppg in a College season, or 6'6" tall. If you compare Frank's stats to these 18 players, he has the absolute lowest Points Per Game average & Steals Per Game average, tied for the lowest Rebounds Per Game average, and tied for 2nd Lowest Assist Per Game average. Not to mention, he is the shortest non true PG.
So, if a NBA GM picks Frank in the 1st round, (on paper) they are making the worst 1st Round Guard position pick in at least the last 3 years. I think Frank is a great player and can definitely be a 1st Round pick once he either shows he can play PG at an NBA-level, or can average 16+ppg in a college season, or grows 3 inches. But until he does at least one of those three things, he is a 'maybe somewhere in the 2nd round pick' - that's a big risk to take for someone that does have the potential to be a lottery pick if he improves his game.