Power versus size for the CSOs and MSOs from various samples: red plus signs are CSOs from An & Baan (2012), gray crosses are low-z CSOs from Snellen et al. (2004), magenta asterisks are MSOs from Kunert-Bajraszewska et al. (2010), and green squares are CSOs and MSOs from Fanti et al. (2001). Circles, triangles, and stars are the CSOs and CSO candidates from our sample: black symbols are CSOs already observed with the VLBA at 4.98 GHz (core-jet blazars have been removed), and the blue symbols are the remaining objects. Thick and thin symbols refer to values computed assuming redshifts of 0.5 and 2, respectively. Stars indicate objects with known redshifts. Illustrative evolutionary tracks are depicted for jet powers of 10⁴⁶ erg s⁻¹ (solid line), 10⁴⁵ erg s⁻¹ (dotted line), 10⁴⁴ erg s⁻¹ (dashed line), and 10⁴³ erg s⁻¹ (dash-dot line).